3187813

This number is a prime.

Single Curio View: (Seek other curios for this number)

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]

Submitted: 2026-07-19 02:54:53; Last Modified: 2026-07-19 13:15:26.