A024678 a(n) is the position of (prime(n+1) + prime(n+2))/2 in the ordered nonprimes.

2, 3, 5, 7, 9, 11, 13, 17, 20, 23, 27, 29, 31, 35, 40, 43, 46, 50, 52, 55, 59, 63, 69, 74, 76, 78, 80, 82, 90, 98, 102, 105, 110, 115, 118, 123, 127, 131, 136, 139, 144, 149, 151, 153, 159, 170, 177, 179, 181, 185, 188, 193, 200, 205, 210, 213, 216, 220, 222, 227, 238, 246, 248

Offset

1,1

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Mathematica

(# - PrimePi[#]) & /@ Table[(Prime[n + 1] + Prime[n + 2])/2, {n, 63}] (* Ivan Neretin, Apr 22 2018 *)

Crossrefs

Sequence in context: A033946 A328232 A189710 * A265384 A039786 A102422

Adjacent sequences: A024675 A024676 A024677 * A024679 A024680 A024681

Keyword

nonn

Author

Clark Kimberling

Status

approved