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A028386 Numbers n such that n(3n-1)/2 is a pentagonal palindrome. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..29.

P. De Geest, Palindromic Pentagonals

CROSSREFS

Cf. A002069, A000326.

Sequence in context: A218258 A186431 A129894 * A259374 A155120 A144691

Adjacent sequences:  A028383 A028384 A028385 * A028387 A028388 A028389

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, extended 11/98.

STATUS

approved

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Last modified September 23 06:51 EDT 2018. Contains 315273 sequences. (Running on oeis4.)