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A085123
Smallest member of A002473 whose digital product = A002473(n), or 0 if no such number exists.
1
1, 2, 3, 4, 5, 6, 7, 8, 9, 25, 126, 27, 35, 28, 36, 45, 0, 64
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
20 is a member of A002473 and the corresponding term is 45 which is also a member of A002473.
CROSSREFS
Cf. A068189.
Sequence in context: A359494 A132416 A128606 * A131571 A179988 A364187
KEYWORD
base,nonn,more
AUTHOR
Amarnath Murthy, Jul 06 2003
EXTENSIONS
a(17) and a(18) from Robert Israel, Nov 23 2019
STATUS
approved