0,3

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

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.

Cf. A000567.

Sequence in context: A264332 A188332 A158922 * A007987 A092397 A096969

Adjacent sequences: A117080 A117081 A117082 * A117084 A117085 A117086

base,nonn

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

approved