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A117650 Heptagonal numbers for which the sum of the digits is also a heptagonal number. 0
1, 7, 34, 189, 403, 783, 1782, 2673, 3186, 3744, 4347, 6426, 7209, 8037, 8910, 10791, 11122, 12852, 13950, 15093, 16281, 17514, 21022, 21483, 24354, 27405, 30636, 32319, 34047, 35820, 39501, 41409, 43362, 45360, 47403, 51624, 53802, 56025 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

EXAMPLE

196981 is in the sequence because it is a heptagonal number and the sum of its digits (34) is also a heptagonal number

CROSSREFS

Cf. A000566.

Sequence in context: A080048 A177140 A027233 * A144038 A027842 A027683

Adjacent sequences:  A117647 A117648 A117649 * A117651 A117652 A117653

KEYWORD

nonn,base

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 11 2006

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Last modified February 16 21:17 EST 2012. Contains 205971 sequences.