A232847 Numbers k such that sum of divisors of k is a square and a triangular number (A000217). That is, numbers k such that A000203(k) is in A001110.

1, 22, 17310, 20802, 23110, 24262, 25995, 26542, 29427, 31735, 33835, 38137, 39287, 39859, 40967, 13595040, 14285160, 15129504, 15378336, 15834528, 15912936, 16327008, 16555752, 16897896, 16908264, 17054388, 17145432, 17749044, 18013428, 20239146, 20713482, 21265578

Offset: 1

Author

Alex Ratushnyak, Dec 01 2013

Keywords

• nonn

Examples

			Sigma(22) = 36. Because 36 is both a square and a triangular number, 22 is in the sequence.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..11083 (terms 1..136 with sigma values <= A001110(8) from Donovan Johnson)

Crossrefs

Cf. A000203, A000217, A000290, A001110.