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A117083 Octagonal numbers for which the product of the digits is also a octagonal number. 0
0, 1, 8, 40, 280, 408, 560, 1045, 1160, 1408, 1680, 2640, 3008, 3201, 3400, 3605, 4033, 4720, 5208, 5720, 7105, 7400, 7701, 8008, 8640, 10325, 10680, 11041, 11408, 12160, 14560, 15408, 16280, 18096, 19040, 20008, 20501, 21000, 21505, 22016, 23056 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..40.

EXAMPLE

27456 is in the sequence because (1) it is a octagonal number and (2) the product of its digits 2*7*4*5*6= 1680 is also a octagonal number.

CROSSREFS

Cf. A000567.

Sequence in context: A264332 A188332 A158922 * A007987 A092397 A096969

Adjacent sequences:  A117080 A117081 A117082 * A117084 A117085 A117086

KEYWORD

base,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 17 2006

STATUS

approved

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Last modified April 28 16:04 EDT 2017. Contains 285578 sequences.