A262490 - cp's OEIS frontend

A262490 The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of four consecutive positive triangular numbers.

n	a(n)
1	9
2	57
3	337
4	1969
5	11481
6	66921
7	390049
8	2273377
9	13250217
10	77227929
11	450117361
12	2623476241
13	15290740089
14	89120964297
15	519435045697
16	3027489309889
17	17645500813641
18	102845515571961
19	599427592618129
20	3493720040136817
21	20362892648202777
22	118683635849079849

[9, 57, 337, 1969, 11481, 66921, 390049, 2273377, 13250217, 77227929, 450117361, 2623476241, 15290740089, 89120964297, 519435045697, 3027489309889, 17645500813641, 102845515571961, 599427592618129, 3493720040136817, 20362892648202777, 118683635849079849]

cp's OEIS Frontend

A262490 The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of four consecutive positive triangular numbers.

Table of values

List of values