159239

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 21.at n=18A031699
• Numbers n such that n^4 is a sum of 4th powers of four nonzero integers whose sum is n.at n=31A138760
• a(n) = 441n^2 + 2n.at n=18A158321
• Sum of the leftmost parts in all compositions of n into distinct parts.at n=29A336896