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A342952
a(n) is the least term in A007602 such that the product of digits equals A342950(n) or 0 if no such number exists.
0
1, 2, 3, 4, 5, 6, 7, 8, 9, 216, 7112, 135, 128, 36, 3171, 432, 0, 11111391, 12712, 1184, 175, 11111292, 1176, 111195, 624, 1171111711, 19116, 147112, 1197, 4224, 114192, 0, 113319, 672, 384, 171171112, 735, 1296, 11872, 0, 17136, 21248, 3915, 3168, 3177111, 13932, 21672
OFFSET
1,2
EXAMPLE
a(10) = 216 as A342950(10) = 12 and 216 is the least number in A007602 that has product of digits 12.
a(17) = 0 as A342950(17) = 25 and the only way the product of digits of a number can be 25 is if the number has two 5's and other digits, if any, are 1. Such a number must end in 5. The tens digit can only be 1 or 5, but no possibility gives a multiple of 25.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
David A. Corneth, Mar 30 2021
STATUS
approved