A098736 a(n) = product of n and all its digits.

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

Offset: 0

Author

Alexandre Wajnberg, Sep 30 2004

Keywords

• base
• easy
• nonn

Examples

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

Links

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

Crossrefs

Cf. A007954, A230101.

Programs

Maple

with transforms; [seq(n*digprod(n), n=0..200)]; # N. J. A. Sloane, Oct 12 2013

Mathematica

Array[# Times@@ IntegerDigits@#&, 60, 0] (* Vincenzo Librandi, Oct 13 2013 *)

PARI

a(n) = vecprod(digits(n))*n; \\ Michel Marcus, Aug 06 2020

Formula

If n=abcd (say) in decimal, then a(n) = abcd * a * b * c * d.

a(n) = n*A007954(n). - R. J. Mathar, Sep 27 2013

Extensions

More terms from Sam Alexander, Jan 06 2005

Corrected by Vincenzo Librandi, Oct 13 2013