A111309 - OEIS

A111309

Absolute difference between the sum of the odd digits and the sum of the even digits of the n-th prime.

2, 3, 5, 7, 2, 4, 8, 10, 1, 7, 4, 10, 3, 1, 3, 8, 14, 5, 1, 8, 10, 16, 5, 1, 16, 2, 4, 8, 10, 5, 6, 5, 11, 13, 6, 7, 13, 2, 2, 11, 17, 6, 11, 13, 17, 19, 0, 1, 3, 5, 4, 10, 5, 4, 10, 5, 1, 6, 12, 9, 7, 10, 10, 5, 7, 11, 7, 13, 6, 8, 11, 17, 4, 13, 19, 2, 4, 19, 3, 5, 6, 5, 0, 2, 8, 5, 1, 8, 9, 7, 3

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OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

Ivars Peterson, Light Rings

EXAMPLE

a(9)=1 because the 9th prime is 23 and the absolute difference between 2 & 3 is 1.

MAPLE

f:= proc(n) local Lo, Le;

Lo, Le:= selectremove(type, convert(n, base, 10), odd);

abs(convert(Lo, `+`)-convert(Le, `+`))