A180456 Central term of seven successive primes whose average is a prime.

17, 53, 109, 157, 173, 193, 227, 229, 281, 349, 439, 607, 659, 701, 709, 827, 883, 977, 1153, 1187, 1301, 1619, 1667, 1867, 2207, 2281, 2287, 2293, 2339, 2671, 2819, 2843, 3001, 3067, 3313, 3457, 3461, 3539, 3673, 3727, 3833, 3943, 4013, 4051, 4517, 4951

Offset

1,1

Comments

The average value is not always the same as the central term.

Links

Table of n, a(n) for n=1..46.

Formula

a(n)=[p(n-3)+p(n-2)+p(n-1)+p(n)+p(n+1)+p(n+2)+p(n+3)]/7

Crossrefs

Sequence in context: A142105 A031383 A248697 * A154409 A033213 A082078

Adjacent sequences: A180453 A180454 A180455 * A180457 A180458 A180459

Keyword

nonn

Author

Carmine Suriano, Sep 06 2010

Status

approved