A230101 a(n) = product of n and all its nonzero digits.

0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 10, 11, 24, 39, 56, 75, 96, 119, 144, 171, 40, 42, 88, 138, 192, 250, 312, 378, 448, 522, 90, 93, 192, 297, 408, 525, 648, 777, 912, 1053, 160, 164, 336, 516, 704, 900, 1104, 1316, 1536, 1764, 250, 255, 520, 795, 1080, 1375, 1680, 1995, 2320, 2655, 360, 366, 744, 1134, 1536, 1950

Offset: 0

Author

N. J. A. Sloane, Oct 12 2013

Keywords

• base
• easy
• nonn

Examples

			a(15) = 15*1*5=75
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 0..1000
• Index entries for Colombian or self numbers and related sequences

Crossrefs

Cf. A007954, A051801, A098736.

Programs

Maple

with transforms; [seq(n*digprod0(n), n=0..200)];

Mathematica

Table[n*Times@@Select[IntegerDigits[n],#!=0&],{n,0,70}] (* Harvey P. Dale, May 26 2018 *)

Formula

a(n) = n*A051801.