A062330 - OEIS

A062330

a(n) = product of the sum and product of the digits of a(n-1) (0 is not to be considered a factor in the product).

2, 4, 16, 42, 48, 384, 1440, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..100

EXAMPLE

a(4) = 42 hence a(5) = (4 + 2) * (4*2) = 6*8 = 48.

PROG

(PARI) SumD(x)= { s=0; while (x>9, s+=x-10*(x\10); x\=10); return(s + x) } ProdNzD(x)= { p=1; while (x>9, d=x-10*(x\10); if (d, p*=d); x\=10); return(p*x) } { for (n=1, 100, if (n>1, a=SumD(a)*ProdNzD(a), a=2); write("b062330.txt", n, " ", a) ) } \\ Harry J. Smith, Aug 05 2009

CROSSREFS

Sequence in context: A333022 A048222 A192890 * A133465 A110128 A370658

Adjacent sequences: A062327 A062328 A062329 * A062331 A062332 A062333

KEYWORD

nonn,base,easy

AUTHOR

Amarnath Murthy, Jun 21 2001

EXTENSIONS

Corrected and extended by Larry Reeves (larryr(AT)acm.org) and Harvey P. Dale, Jun 22 2001

STATUS

approved