1,786,772,701,928,802,632,268,715,130,455,793

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Number

$1 \, 786 \, 772 \, 701 \, 928 \, 802 \, 632 \, 268 \, 715 \, 130 \, 455 \, 793$ is:

$2521 \times 49 \, 993 \times 14 \, 177 \, 095 \, 479 \, 037 \, 851 \, 751 \, 198 \, 481$

The $1$st term of a general Fibonacci sequence whose first $2$ terms are coprime such that all its terms were mistakenly believed at one time to be composite:

$1 \, 786 \, 772 \, 701 \, 928 \, 802 \, 632 \, 268 \, 715 \, 130 \, 455 \, 793$, $1 \, 059 \, 683 \, 225 \, 053 \, 915 \, 111 \, 058 \, 165 \, 141 \, 686 \, 995$, $2 \, 846 \, 455 \, 926 \, 982 \, 717 \, 743 \, 326 \, 880 \, 272 \, 142 \, 788$, $\ldots$

Also see

• Next: General Fibonacci Sequence whose Terms are all Composite/Mistake 2

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1,786,772,701,928,802,632,268,715,130,455,793$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1,786,772,701,928,802,632,268,715,130,455,793$