A104250 - OEIS

A104250

Sum of prime digits of n-th prime.

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

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..97.

FORMULA

a(n)=A007605(n)-A104251(n)

EXAMPLE

a(6)=3 because sum of prime digits of Prime[6]=13 is 3.

MATHEMATICA

npd[n_]:=Total[Select[IntegerDigits[n], PrimeQ]]; Table[npd[p], {p, Prime[ Range[100]]}] (* Harvey P. Dale, Apr 24 2014 *)

CROSSREFS