A102258 - OEIS

A102258

Begin with 5, multiply each digit by 2.

5, 10, 2, 0, 4, 0, 8, 0, 16, 0, 2, 12, 0, 4, 2, 4, 0, 8, 4, 8, 0, 16, 8, 16, 0, 2, 12, 16, 2, 12, 0, 4, 2, 4, 2, 12, 4, 2, 4, 0, 8, 4, 8, 4, 2, 4, 8, 4, 8, 0, 16, 8, 16, 8, 4, 8, 16, 8, 16, 0, 2, 12, 16, 2, 12, 16, 8, 16, 2, 12, 16, 2, 12, 0, 4, 2, 4, 2, 12, 4, 2, 4, 2, 12, 16, 2, 12, 4, 2, 4, 2, 12, 4

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..93.

FORMULA

d*2, beginning with 5

EXAMPLE

Read a(2)=10 which produces a(3)=2 & a(4)=0 because 1*2=2 and 0*2=0

Now read a(3)=2 which produces [a(4) is already written] a(5)=4 because 2*2=4.

MATHEMATICA

Flatten[ NestList[ Function[x, Flatten[FromDigits /@ 2IntegerDigits[x]]], 5, 15]] (* Robert G. Wilson v, Feb 21 2005 *)