# Category:Mistakes/Curious and Interesting Numbers

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This category reports on mistakes in *Curious and Interesting Numbers* by David Wells.

## Pages in category "Mistakes/Curious and Interesting Numbers"

The following 182 pages are in this category, out of 182 total.

### 1

### 9

### A

- Definition:Ackermann Function/Mistake 1
- Definition:Ackermann Function/Mistake 2
- Amicable Pair with Smallest Common Prime Factor 5/Mistake
- Amicable Pair/Examples/59,554,936,495,441,481,044,788,091,271,148,664,944,796,300,859,243,635,311,219,048,448-59,554,936,495,441,891,385,123,332,422,108,719,776,971,992,921,810,832,072,976,105,472/Mistake
- Amicable Pairs with Common Factor 3/Mistake
- Definition:Apothecaries' Ounce/Mistake
- Definition:Arabic Numerals/Historical Note/Mistake
- Archimedes' Cattle Problem/Mistake

### C

### D

### E

### F

- Factorial as Product of Consecutive Factorials/Mistake
- Feit-Thompson Conjecture/Stronger/Mistake
- Feit-Thompson Conjecture/Stronger/Mistake/First Edition
- Feit-Thompson Conjecture/Stronger/Mistake/Second Edition
- Definition:Fermat Pseudoprime/Base 4/Mistake
- Fibonacci Number as Sum of Binomial Coefficients/Mistake
- Fibonacci Number as Sum of Binomial Coefficients/Mistake/First Edition
- Fibonacci Number as Sum of Binomial Coefficients/Mistake/Second Edition
- Fibonacci Numbers with no Primitive Prime Factors/Mistake
- Definition:Fischer-Griess Monster/Historical Note/Mistake
- Fourth Powers which are Sum of 4 Fourth Powers/Mistake

### G

### H

### I

### K

### L

### M

- Definition:Magic Hexagon/Mistake
- Mersenne Number whose Index is Mersenne Prime/Mistake
- Definition:Mersenne Number/Mistake
- Multiple of 999 can be Split into Groups of 3 Digits which Add to 999/Mistake
- Multiplicative Magic Square/Examples/Order 3/Smallest/Historical Note/Mistake
- Multiply Perfect Number of Order 8/Mistake

### N

- No 4 Fibonacci Numbers can be in Arithmetic Progression/Mistake
- Non-Palindromes in Base 2 by Reverse-and-Add Process/Mistake
- Number of Different Ways to play First n Moves in Chess/Mistake
- Number of Fibonacci Numbers with Same Number of Decimal Digits/Mistake
- Number of Primes up to n Approximates to Eulerian Logarithmic Integral/Mistake
- Numbers equal to Sum of Primes not Greater than its Prime Counting Function Value/Mistake
- Numbers such that Tau divides Phi divides Sigma/Mistake
- Numbers whose Cube equals Sum of Sequence of that many Squares/Mistake
- Numbers whose Difference equals Difference between Cube and Seventh Power/Mistake

### P

- Palindromic Smith Number/Examples/123,455,554,321/Mistake
- Palindromic Triangular Numbers/Mistake
- Pandigital Integers remaining Pandigital on Multiplication/Mistake
- Pascal's Rule/Mistake
- Pentagonal and Hexagonal Numbers/Mistake
- Perfect Digit-to-Digit Invariant/Examples/3435/Mistake
- Perfect Number is Sum of Successive Odd Cubes except 6/Mistake
- Definition:Perfect Number/Historical Note/Mistake 1
- Definition:Perfect Number/Historical Note/Mistake 2
- Period of Reciprocal of 729 is 81/Mistake
- Definition:Pi/Decimal Expansion/Mistake
- Definition:Pi/Historical Note/Modern Developments/Mistake
- Definition:Pi/Historical Note/Notation/Mistake
- Definition:Plato's Geometrical Number/Mistake
- Polydivisible Number/Examples/381,654,729/Mistake
- Positive Integer is Divisible by Sum of Consecutive Integers iff not Power of 2/Mistake
- Prime between n and 9 n divided by 8/Mistake
- Prime Decomposition of 5th Fermat Number/Mistake
- Prime Decomposition of 7th Fermat Number/Mistake
- Prime Factors of 35, 36, 4734 and 4735/Mistake
- Prime Magic Square/Examples/Order 12/Smallest with Consecutive Primes from 3/Mistake
- Probability of All Players receiving Complete Suit at Bridge/Mistake
- Product of Sequence of Fermat Numbers plus 2/Mistake
- Product of Two Triangular Numbers to make Square/Mistake
- Product with Repdigit can be Split into Parts which Add to Repdigit/Mistake
- Products of 2-Digit Pairs which Reversed reveal Same Product/Mistake
- Properties of Family of 333,667 and Related Numbers/Mistake
- Pythagorean Triangle with Sides in Arithmetic Progression/Mistake
- Pépin's Test/Mistake

### R

- Definition:Rare Number/Mistake
- Reciprocal of 142,857/Mistake
- Reciprocal of 89/Mistake
- Reciprocals of Odd Numbers adding to 1/Mistake
- Recurring Part of Fraction times Period gives 9-Repdigit/Mistake
- Recurring Part of Fraction times Period gives 9-Repdigit/Mistake/First Edition
- Recurring Part of Fraction times Period gives 9-Repdigit/Mistake/Second Edition
- Relation between Square of Fibonacci Number and Square of Lucas Number/Mistake
- Definition:Right-Truncatable Prime/Mistake

### S

- Schatunowsky's Theorem/Mistake
- Definition:Semiperfect Number/Mistake
- Sequence of 9 Consecutive Integers each with 48 Divisors/Mistake
- Sequence of Fibonacci Numbers ending in Index/Mistake
- Sequence of Integers whose Factorial plus 1 is Prime/Mistake
- Sequence of Prime Primorial minus 1/Mistake
- Sequence of Square Centered Hexagonal Numbers/Mistake
- Sequence of Triplets of Primitive Pythagorean Triangles with Same Area/Mistake
- Sets of 4 Prime Quadruples/Mistake
- Smallest Fermat Pseudoprime to Bases 2, 3, 5 and 7/Mistake
- Smallest Integer not Sum of Two Ulam Numbers/Mistake
- Smallest Integer which is Product of 4 Triples all with Same Sum/Mistake
- Smallest Odd Number not of form 2 a squared plus p/Mistake
- Smallest Pandigital Square/Mistake
- Smallest Positive Integer not of form +-4 mod 9 not representable as Sum of Three Cubes/Mistake
- Smallest Set of Weights for Two-Pan Balance/Mistake
- Sociable Chain/Examples/12,496/Mistake
- Solution of Ljunggren Equation/Mistake
- Solutions of Diophantine Equation x^4 + y^4 = z^2 + 1 for x = 239/Mistake
- Solutions of Ramanujan-Nagell Equation/Mistake
- Solutions to Approximate Fermat Equation x^3 = y^3 + z^3 Plus or Minus 1/Mistake
- Solutions to p^2 Divides 10^p - 10/Mistake
- Definition:Speed of Light/Mistake
- Spherical Law of Sines/Historical Note/Mistake
- Square Numbers which are Sum of Sequence of Odd Cubes/Mistake
- Square of Small Repunit is Palindromic/Mistake
- Square of Small Repunit is Palindromic/Mistake/First Edition
- Square of Small Repunit is Palindromic/Mistake/Second Edition
- Squares Ending in 5 Occurrences of 2-Digit Pattern/Mistake
- Squares whose Digits can be Separated into 2 other Squares/Mistake
- St. Ives Problem/Historical Note/Mistake
- Subfactorial/Examples/5/Mistake
- Sum of 2 Squares in 2 Distinct Ways/Examples/145/Mistake
- Sum of 2 Squares in 2 Distinct Ways/Examples/145/Mistake/First Edition
- Sum of 2 Squares in 2 Distinct Ways/Examples/145/Mistake/Second Edition
- Sum of 4 Consecutive Binomial Coefficients forming Square/Mistake

### T

- Tamura-Kanada Circuit Method/Example/Mistake
- Tau Function of 108/Mistake
- Titanic Sophie Germain Prime/Mistake 1
- Titanic Sophie Germain Prime/Mistake 2
- Triangles with Integer Area and Integer Sides in Arithmetical Progression/Mistake
- Triangular Number Pairs with Triangular Sum and Difference/Examples/T1869, T2090/Mistake
- Triangular Number Pairs with Triangular Sum and Difference/Examples/T39, T44/Mistake
- Triangular Number Pairs with Triangular Sum and Difference/Mistake
- Triangular Numbers which are Product of 3 Consecutive Integers/Mistake
- Definition:Triperfect Number/Mistake
- Triplets of Products of Two Distinct Primes/Mistake