OFFSET
0,3
EXAMPLE
27456 is in the sequence because (1) it is an octagonal number and (2) the product of its digits 2*7*4*5*6 = 1680 is also an octagonal number.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Luc Stevens (lms022(AT)yahoo.com), Apr 17 2006
STATUS
approved