A251793 - cp's OEIS frontend

A251793 Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to the sum of the octagonal numbers N(m) and N(m+1) for some m.

n	a(n)
1	0
2	2
3	68
4	286
5	6760
6	28122
7	662508
8	2755766
9	64919120
10	270037042
11	6361411348
12	26460874446
13	623353393080
14	2592895658762
15	61082271110588
16	254077313684326
17	5985439215444640
18	24896983845405282
19	586511960842464228
20	2439650339536033406

[0, 2, 68, 286, 6760, 28122, 662508, 2755766, 64919120, 270037042, 6361411348, 26460874446, 623353393080, 2592895658762, 61082271110588, 254077313684326, 5985439215444640, 24896983845405282, 586511960842464228, 2439650339536033406]

cp's OEIS Frontend

A251793 Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to the sum of the octagonal numbers N(m) and N(m+1) for some m.

Table of values

List of values