A117083 Octagonal numbers for which the product of the digits is also an octagonal number.

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

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 A343868 A350125

Adjacent sequences: A117080 A117081 A117082 * A117084 A117085 A117086

Keyword

base,nonn

Author

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

Status

approved