A172115 Partial sums of A001605.

3, 7, 12, 19, 30, 43, 60, 83, 112, 155, 202, 285, 416, 553, 912, 1343, 1776, 2225, 2734, 3303, 3874, 6845, 11568, 16955, 26266, 35943, 50374, 75935, 106692, 142691, 180202, 231035, 312874, 417785, 547806, 695897, 897004, 1294383, 1728164, 2318205, 2911894, 3516605

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..56 (calculated from the data at A001605)

Example

a(1) = 3.
a(2) = 3 + 4 = 7.
a(3) = 3 + 4 + 5 = 12.

Crossrefs

Cf. A001605, A001578, A005478, A086597, A080345.

Sequence in context: A039677 A011899 A002498 * A328655 A091369 A036698

Adjacent sequences: A172112 A172113 A172114 * A172116 A172117 A172118

Keyword

hard,nonn

Author

Jonathan Vos Post, Jan 25 2010

Extensions

a(40) onwards from Amiram Eldar, Jul 22 2025

Status

approved