A274587 - cp's OEIS frontend

A274587 Values of n such that 2n-1 and 4n-1 are both triangular numbers.

n	a(n)
1	1
2	23
3	176
4	5968
5	888778
6	30192278
7	233944673
8	7947232183
9	1183597668523
10	40207478867501
11	311547395822378
12	10583440358908726
13	1576213585538112676
14	53544862512524597468
15	414892028679967914251
16	14094115694115827467213
17	2099065698850118586101173

[1, 23, 176, 5968, 888778, 30192278, 233944673, 7947232183, 1183597668523, 40207478867501, 311547395822378, 10583440358908726, 1576213585538112676, 53544862512524597468, 414892028679967914251, 14094115694115827467213, 2099065698850118586101173]

cp's OEIS Frontend

A274587 Values of n such that 2n-1 and 4n-1 are both triangular numbers.

Table of values

List of values

cp's OEIS Frontend

A274587 Values of n such that 2*n-1 and 4*n-1 are both triangular numbers.

Table of values

List of values

A274587 Values of n such that 2n-1 and 4n-1 are both triangular numbers.