A007610 - OEIS

A007610

Sum of n consecutive primes starting at a(n) is prime (or 0 if impossible).
(Formerly M0343)

2, 2, 5, 2, 5, 2, 17, 0, 3, 0, 5, 2, 29, 2, 3, 0, 3, 0, 11, 0, 7, 0, 7, 0, 5, 0, 7, 0, 13, 0, 13, 0, 7, 0, 5, 0, 5, 0, 13, 0, 7, 0, 7, 0, 7, 0, 7, 0, 11, 0, 17, 0, 3, 0, 3, 0, 97, 0, 29, 2, 3, 0, 13, 2, 3, 0, 19, 0, 19, 0, 3, 0, 5, 0, 3, 0, 23, 0, 7, 0, 11, 0, 53, 0, 31, 0, 89, 0, 53, 0, 19, 0, 11, 0, 3, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

a(n) = 0 iff n is even and the sum of 2..P(n) is not prime. See A013916. - Robert G. Wilson v, Feb 16 2002

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

C. W. Trigg, Prime sums of consecutive primes, J. Rec. Math., 18 (No. 4, 1985-1986), 247-248.

LINKS

T. D. Noe, Table of n, a(n) for n = 1..10000

C. W. Trigg, Prime sums of consecutive primes, J. Rec. Math., 18 (No. 4, 1985-1986), 247-248. (Annotated scanned copy)

MATHEMATICA

f[n_] := If[OddQ@ n, Block[{k = 1}, While[ !PrimeQ[Plus @@ Prime[Range[k, k + n - 1]]], k++]; Prime@ k], If[ PrimeQ[Plus @@ Prime@ Range@ n], 2, 0]]; Array[f, 96] (* Robert G. Wilson v, May 11 2015 *)

CROSSREFS

Cf. A013916, A071149.

Sequence in context: A076200 A039931 A128645 * A068066 A171889 A171868

Adjacent sequences: A007607 A007608 A007609 * A007611 A007612 A007613

KEYWORD

nonn,nice,easy

AUTHOR

N. J. A. Sloane, Robert G. Wilson v, Mira Bernstein

STATUS

approved