A028386 Numbers k such that k*(3k-1)/2 is a pentagonal palindrome.
1, 2, 4, 26, 44, 101, 693, 2173, 2229, 4228, 6010, 26466, 26906, 31926, 44059, 1258723, 1965117, 1979130, 2684561, 13280839, 59401650, 84885761, 100058581, 225563533, 316882086, 700457153, 818049201, 851649306, 1345679688, 2049123156, 6693818696, 18306458265, 18517422797
Offset: 1
Links
- Bert Dobbelaere, Table of n, a(n) for n = 1..57
- Patrick De Geest, Palindromic Pentagonals
Extensions
More terms from Patrick De Geest, Nov 15 1998
More terms from Bert Dobbelaere, Apr 15 2025