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A115707 Pentagonal numbers (A000326) whose digit reversal is a prime. +0
2
5, 35, 70, 92, 145, 376, 1520, 1820, 3577, 3725, 7526, 9322, 9560, 10045, 10292, 13490, 14065, 16801, 17767, 18760, 32782, 34126, 34580, 36895, 38320, 38801, 39772, 73151, 74482, 76501, 78547, 91390, 93625, 94376, 98176, 100492, 101270 (list; graph; listen)
OFFSET

1,1

EXAMPLE

145 is the 10th pentagonal number and 541 is prime.

CROSSREFS

Cf. A000326, A115706.

Sequence in context: A128044 A014632 A117985 this_sequence A117793 A145920 A090294

Adjacent sequences: A115704 A115705 A115706 this_sequence A115708 A115709 A115710

KEYWORD

nonn,base

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.


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