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

Author

Rémy Sigrist, Apr 14 2021

Keywords

• nonn
• base

Comments

Each 7-smooth number (A002473) appears exactly once in the sequence.

Examples

			For n = 42:
- A343403(42) = 259,
- so a(42) = 2*5*9 = 90.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, PARI program for A343160

Crossrefs

Cf. A002473, A007954, A343403.

Programs

PARI

See Links section.

Formula

a(n) = A007954(A343403(n)).