A129444 - cp's OEIS frontend

A129444 Numbers k such that the centered triangular number A005448(k) = 3k(k-1)/2 + 1 is a perfect square.

n	a(n)
1	0
2	1
3	2
4	7
5	16
6	65
7	154
8	639
9	1520
10	6321
11	15042
12	62567
13	148896
14	619345
15	1473914
16	6130879
17	14590240
18	60689441
19	144428482
20	600763527
21	1429694576
22	5946945825
23	14152517274
24	58868694719
25	140095478160
26	582740001361
27	1386802264322

[0, 1, 2, 7, 16, 65, 154, 639, 1520, 6321, 15042, 62567, 148896, 619345, 1473914, 6130879, 14590240, 60689441, 144428482, 600763527, 1429694576, 5946945825, 14152517274, 58868694719, 140095478160, 582740001361, 1386802264322]

cp's OEIS Frontend

A129444 Numbers k such that the centered triangular number A005448(k) = 3k(k-1)/2 + 1 is a perfect square.

Table of values

List of values

cp's OEIS Frontend

A129444 Numbers k such that the centered triangular number A005448(k) = 3*k*(k-1)/2 + 1 is a perfect square.

Table of values

List of values

A129444 Numbers k such that the centered triangular number A005448(k) = 3k(k-1)/2 + 1 is a perfect square.