A307645 Numbers that are the sum of a positive triangular number and a positive cube.

2, 4, 7, 9, 11, 14, 16, 18, 22, 23, 28, 29, 30, 33, 36, 37, 42, 44, 46, 48, 53, 55, 56, 63, 65, 67, 70, 72, 74, 79, 82, 85, 86, 92, 93, 99, 100, 105, 106, 109, 113, 118, 119, 121, 126, 128, 130, 131, 132, 135, 137, 140, 142, 144, 146, 147, 153, 154, 155, 161, 163, 169, 170, 172, 179

Offset

1,1

Links

Table of n, a(n) for n=1..65.

Formula

Exponents in expansion of (Sum_{i>=1} x^(i*(i+1)/2)) * (Sum_{j>=1} x^(j^3)).

Crossrefs

Cf. A000217, A000578, A014133, A014155, A133254.

Sequence in context: A054406 A292647 A356085 * A287235 A190004 A182761

Adjacent sequences: A307642 A307643 A307644 * A307646 A307647 A307648

Keyword

nonn

Author

Ilya Gutkovskiy, Apr 19 2019

Status

approved