A062839 a(n) = floor((prime(n-1)+prime(n+1))/2).

1, 3, 5, 8, 10, 14, 16, 20, 24, 27, 33, 36, 40, 44, 48, 53, 57, 63, 66, 70, 75, 78, 84, 90, 95, 100, 104, 106, 110, 118, 122, 132, 135, 143, 145, 153, 157, 162, 168, 173, 177, 185, 187, 194, 196, 204, 211, 219, 226, 230, 234, 237, 245, 249, 257, 263, 267, 273

Offset: 1

Author

Jason Earls, Jul 21 2001

Keywords

• nonn

Crossrefs

Cf. A000040, A024675, A028334.

Programs

PARI

j=[]; for(n=1,200,j=concat(j,floor((prime(n-1)+prime(n+1))/2))); j

Formula

a(n) = A024675(n-1) - A028334(n-1), n>2. - R. J. Mathar, Apr 16 2008