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A117710 Pentagonal numbers for which the product of the digits is also a pentagonal number. 0
0, 1, 5, 51, 70, 210, 330, 590, 715, 1001, 1080, 1162, 1520, 1820, 2035, 2380, 2501, 3015, 3290, 3725, 4030, 4510, 5017, 5370, 6112, 6305, 6501, 6700, 6902, 7107, 7740, 8400, 9087, 9560, 9801, 10045, 10292, 10542, 10795, 11051, 11310, 11572, 12105 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..42.

EXAMPLE

715 is in the sequence because it is a pentagonal number and the product of its digits 7*1*5=35 is also a pentagonal number.

CROSSREFS

Cf. A000326.

Sequence in context: A326738 A322927 A333261 * A064019 A134938 A068540

Adjacent sequences:  A117707 A117708 A117709 * A117711 A117712 A117713

KEYWORD

base,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 13 2006

STATUS

approved

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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)