A343160 a(n) is the product of the decimal digits of A343403(n).

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

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program for A343160

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

Cf. A002473, A007954, A343403.

Sequence in context: A096868 A266351 A206718 * A190760 A067036 A119823

Adjacent sequences: A343157 A343158 A343159 * A343161 A343162 A343163

Keyword

nonn,base

Author

Rémy Sigrist, Apr 14 2021

Status

approved