A075674 Sum of next n odd interprimes.

9, 36, 153, 378, 805, 1576, 2733, 3818, 5857, 8006, 10537, 14812, 19389, 23472, 29757, 36416, 44067, 52274, 61307, 71740, 86195, 104056, 120463, 138128, 158209, 181160, 205973, 229728, 255013, 281608

Offset

1,1

Comments

Sum of next n primes in A007468. Sum of next n integer interprimes in A075673. Sum of next n even interprimes in A075675.

Links

Table of n, a(n) for n=1..30.

Example

a(1) = (7+11)/2 = 9; a(2) = (13+17)/2+(19+23)/2 = 15 + 21 = 36.

Mathematica

(* sum of next n odd interprimes*) od=Select[Table[(Prime[i]+Prime[i+1])/2, {i, 2, 2000}], OddQ]; i1 := n(n-1)/2+1; i2 := n(n-1)/2+n; A075674=Table[Sum[od[[i]], {i, i1, i2}], {n, 30}]

Crossrefs

Cf. A007468, A075673, A075674, A075675.

Sequence in context: A264515 A002063 A285674 * A245416 A265837 A264359

Adjacent sequences: A075671 A075672 A075673 * A075675 A075676 A075677

Keyword

nonn

Author

Zak Seidov, Sep 24 2002

Status

approved