A274588 - cp's OEIS frontend

A274588 Values of n such that 2n-1 and 7n-1 are both triangular numbers.

n	a(n)
1	1
2	8
3	638
4	6931
5	572671
6	6223778
7	514257668
8	5588945461
9	461802812941
10	5018866799948
11	414698411763098
12	4506936797407591
13	372398711960448811
14	4047224225205216518
15	334413628642071268928
16	3634402847297487025321
17	300303066121868039048281

[1, 8, 638, 6931, 572671, 6223778, 514257668, 5588945461, 461802812941, 5018866799948, 414698411763098, 4506936797407591, 372398711960448811, 4047224225205216518, 334413628642071268928, 3634402847297487025321, 300303066121868039048281]

cp's OEIS Frontend

A274588 Values of n such that 2n-1 and 7n-1 are both triangular numbers.

Table of values

List of values

cp's OEIS Frontend

A274588 Values of n such that 2*n-1 and 7*n-1 are both triangular numbers.

Table of values

List of values

A274588 Values of n such that 2n-1 and 7n-1 are both triangular numbers.