OFFSET
0,3
EXAMPLE
42960 is in the sequence because (1) it is an octagonal number, the sum of its digits 4+2+9+6+0 = 21 is an octagonal number and (3) the product of its digits 4*2*9*6*0 = 0 is also an octagonal number.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Luc Stevens (lms022(AT)yahoo.com), Apr 17 2006
STATUS
approved