150848

Appears in sequences

• a(1) = 1. a(n) = sum of the earlier terms of the sequence, a(k), where GCD(n,a(k)) is <= k, for 1 <= k <= n-1.at n=21A119990
• The first of two consecutive positive integers the sum of the squares of which is equal to the sum of the squares of ten consecutive positive integers.at n=12A261932