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a(n) is the difference in A064413 between the index of p, the n-th prime, and the index of (p-1).
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%I #30 Oct 05 2016 10:20:38

%S 1,3,7,10,11,21,16,25,24,31,38,37,34,46,47,53,51,63,69,79,75,81,87,88,

%T 91,103,102,104,109,112,119,140,127,133,134,146,150,156,155,164,170,

%U 175,189,193,197,197,209,215,215,224,221,237,237,246,247,249,254,266

%N a(n) is the difference in A064413 between the index of p, the n-th prime, and the index of (p-1).

%F a(n) = A064664(A000040(n)) - A064664(A006093(n)).

%F a(n) = A064664(prime(n)) - A064664(prime(n)-1).

%K nonn

%O 1,2

%A _Alec Jones_, Aug 31 2016