57770

Appears in sequences

• a(n)=n if n <= 3, otherwise a(n) = A007477(n-1) + A007477(n).at n=16A213705
• Numbers which are the sum of two squared primes in exactly three ways (ignoring order).at n=23A226562
• a(n) = cpg(3, n) + cpg(4, n) + ... + cpg(n, n) where cpg(m, n) is the n-th m-th-order centered polygonal number.at n=22A257052