A104251 Sum of nonprime digits of n-th prime.

0, 0, 0, 0, 2, 1, 1, 10, 0, 9, 1, 0, 5, 4, 4, 0, 9, 7, 6, 1, 0, 9, 8, 17, 9, 2, 1, 1, 10, 2, 1, 2, 1, 10, 14, 2, 1, 7, 7, 1, 10, 10, 11, 10, 10, 19, 2, 0, 0, 9, 0, 9, 5, 1, 0, 6, 15, 1, 0, 9, 8, 9, 0, 2, 1, 1, 1, 0, 4, 13, 0, 9, 6, 0, 9, 8, 17, 9, 5, 13, 14, 5, 5, 4, 13, 8, 17, 4, 11, 10, 10, 13, 12

Offset: 1

Author

Zak Seidov, Feb 26 2005

Keywords

• nonn
• base

Examples

			a(6)=1 because sum of composite (nonprime) digits of prime(6)=13 is 1.
		

Crossrefs

Cf. A000040 (primes).

Cf. A007605 (sum of digits of primes), A104250 (sum of prime digits of n-th prime).

Formula

a(n) = A007605(n) - A104250(n).