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A023508 Sum of exponents in prime-power factorization of n-th prime - 1. 4

%I #18 Feb 18 2024 02:02:40

%S 0,1,2,2,2,3,4,3,2,3,3,4,4,3,2,3,2,4,3,3,5,3,2,4,6,4,3,2,5,5,4,3,4,3,

%T 3,4,4,5,2,3,2,5,3,7,4,4,4,3,2,4,4,3,6,4,8,2,3,5,4,5,3,3,4,3,5,3,4,6,

%U 2,4,6,2,3,4,5,2,3,5,6,5,3,5,3,7,3,3,7,5,4,4,2,2,6,4,3,2,3,5,4

%N Sum of exponents in prime-power factorization of n-th prime - 1.

%F a(n) = A001222(A006093(n)). - _R. J. Mathar_, Feb 06 2019

%t Array[Plus@@Last/@FactorInteger[Prime[ # ]-1]&,6! ] (* _Vladimir Joseph Stephan Orlovsky_, Feb 28 2010 *)

%Y Cf. A210936

%K nonn

%O 1,3

%A _Clark Kimberling_

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Last modified March 28 11:46 EDT 2024. Contains 371241 sequences. (Running on oeis4.)