3187813
This number is a prime.
A palindromic prime equal to the sum of squares of two consecutive
integers: 12622 + 12632. [De Geest]
3187813 — Conjectured to be the largest palindromic prime
that is a sum of two consecutive squares, n² + (n+1)². Open
since 1997; no larger example found through 27 digits. [Adams]
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