245

Number
$245$ (two hundred and forty-five) is:


 * $5 \times 7^2$


 * The $2$nd of the $9$th pair of consecutive integers which both have $6$ divisors:
 * $\map {\sigma_0} {244} = \map {\sigma_0} {245} = 6$


 * The $4$th of the $1$st quadruple of consecutive integers which all have an equal divisors:
 * $\map {\sigma_0} {242} = \map {\sigma_0} {243} = \map {\sigma_0} {244} = \map {\sigma_0} {245} = 6$


 * The largest odd positive integer that cannot be expressed as the sum of exactly $5$ non-zero square numbers all of which are coprime.


 * The $16$th positive integer $n$ after $0$, $1$, $5$, $25$, $29$, $41$, $49$, $61$, $65$, $85$, $89$, $101$, $125$, $145$, $149$ such that the Fibonacci number $F_n$ ends in $n$

Also see

 * Odd Numbers Not Expressible as Sum of 5 Distinct Non-Zero Coprime Squares