A152531 a(n) = (p(n)*p(n+2) - p(n+1))/2, where p(n) is the n-th odd prime.

8, 24, 40, 87, 115, 186, 264, 342, 521, 617, 775, 942, 1116, 1360, 1587, 1946, 2132, 2410, 2768, 2990, 3474, 3981, 4446, 4945, 5352, 5560, 5991, 6865, 7338, 8634, 9036, 10137, 10420, 11621, 12228, 13028, 14016, 14860, 15567, 17004

Offset

1,1

Comments

This is A111071 without its first term. - R. J. Mathar, Jul 27 2015

Links

Table of n, a(n) for n=1..40.

Formula

a(n) = A152530(n+1)/2.

Maple

A152531 := proc(n)
    j := n+1 ;
    ithprime(j)*ithprime(j+2)-ithprime(j+1) ;
    %/2 ;
end proc: # R. J. Mathar, Jul 28 2015

Mathematica

(First[#]*Last[#]-#[[2]])/2&/@Partition[Prime[Range[2, 50]], 3, 1] (* Harvey P. Dale, Oct 09 2014 *)

Crossrefs

Cf. A065091, A111071, A152527, A152528, A152529, A152530, A152532.

Sequence in context: A031046 A173080 A051062 * A074348 A063403 A355433

Adjacent sequences: A152528 A152529 A152530 * A152532 A152533 A152534

Keyword

easy,nonn

Author

Omar E. Pol, Dec 06 2008

Status

approved