A262489 - cp's OEIS frontend

A262489 The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of three consecutive positive triangular numbers.

n	a(n)
1	7
2	18
3	78
4	187
5	781
6	1860
7	7740
8	18421
9	76627
10	182358
11	758538
12	1805167
13	7508761
14	17869320
15	74329080
16	176888041
17	735782047
18	1751011098
19	7283491398
20	17333222947
21	72099131941
22	171581218380
23	713707828020
24	1698478960861
25	7064979148267
26	16813208390238

[7, 18, 78, 187, 781, 1860, 7740, 18421, 76627, 182358, 758538, 1805167, 7508761, 17869320, 74329080, 176888041, 735782047, 1751011098, 7283491398, 17333222947, 72099131941, 171581218380, 713707828020, 1698478960861, 7064979148267, 16813208390238]

cp's OEIS Frontend

A262489 The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of three consecutive positive triangular numbers.

Table of values

List of values