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A343160
a(n) is the product of the decimal digits of A343403(n).
2
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 15, 21, 24, 27, 20, 28, 32, 36, 25, 30, 35, 40, 45, 42, 48, 54, 49, 56, 63, 64, 72, 81, 50, 60, 70, 80, 90, 84, 96, 108, 98, 112, 126, 128, 144, 162, 75, 105, 120, 135, 147, 168, 189, 192, 216, 243, 100, 140
OFFSET
1,3
COMMENTS
Each 7-smooth number (A002473) appears exactly once in the sequence.
LINKS
FORMULA
a(n) = A007954(A343403(n)).
EXAMPLE
For n = 42:
- A343403(42) = 259,
- so a(42) = 2*5*9 = 90.
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Rémy Sigrist, Apr 14 2021
STATUS
approved