A153136 Smallest sequence of primes such that no sum of at least two terms is prime

2, 7, 13, 43, 103, 1627, 25349, 315743, 7338823, 42939980423

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Prog

(PARI) a=[]; for(n=1, 10, forprime(p=2, , setsearch(a, p)&&next; for(i=1, 2^#a-1, isprime(normlp(vecextract(a, i), 1)+p)&&next(2)); a=concat(a, p); print1(p", "))) \\ Very simplistic, should at least avoid an odd number of odd primes in the partial sum of earlier terms. \\ M. F. Hasler, Jan 29 2015

Crossrefs

Cf. A153137, A153138, A133660, A052349, A254337, A254341.

Sequence in context: A026555 A262727 A129592 * A178607 A321407 A127487

Adjacent sequences: A153133 A153134 A153135 * A153137 A153138 A153139

Keyword

more,nonn

Author

Benoit Jubin, Dec 19 2008

Extensions

a(8)-a(10) from Donovan Johnson, Dec 23 2008

Status

approved