A174862 Smallest prime p such that the sum of the squares of primes up to p is a multiple of 10^n.
907, 977, 977, 36643, 1067749, 17777197, 71622461, 2389799983, 31252968359, 49460594569, 1915014433303, 4076200167673
Offset: 1
Examples
For a(1) = 907, 2^2 + 3^2 + 5^2 + ... + 907^2 = 37464550, which is a multiple of 10^1. For a(2) = 977, 2^2 + ... + 977^2 = 46403000, which is a multiple of 10^2 and 10^3.
Links
- Mersenneforum, Sums of Squares puzzle, Mar 18 2010.
- Ben Buhrow, Software and extended tables.
Comments