OFFSET
1,2
COMMENTS
Conjecture: No entry is zero.
Next term (A002473(n) = 21) is either 0 or > 10^100. - David Wasserman, Jan 27 2005
a(17) = 0, because A002473(17) = 21 = 3*7 and the last two digits of every member of A002473 greater than 7 contain a digit other than 1, 3, and 7. - Robert Israel, Nov 23 2019
Similarly, a(n) = 0 whenever n >=17 and A002473(n) is coprime to 10. - Robert Israel, Nov 24 2019
EXAMPLE
CROSSREFS
KEYWORD
base,nonn,more
AUTHOR
Amarnath Murthy, Jul 06 2003
EXTENSIONS
a(17) and a(18) from Robert Israel, Nov 23 2019
STATUS
approved