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Search: id:A028386
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A028386 Numbers n such that n(3n-1)/2 is a pentagonal palindrome. +0
3
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; listen)
OFFSET

1,2
LINKS

P. De Geest, Palindromic Pentagonals

CROSSREFS

Cf. A002069, A000326.

Adjacent sequences: A028383 A028384 A028385 this_sequence A028387 A028388 A028389

Sequence in context: A162118 A128774 A129894 this_sequence A155120 A144691 A085700

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), extended 11/98.

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Last modified November 3 12:59 EST 2009. Contains 165766 sequences.

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