1,2

Except first term, numbers n such that the sum of the first n primes is composite: Essentially the complement of A013916.

Table of n, a(n) for n=1..71.

Join[{1}, Flatten[Position[Accumulate[Prime[Range[80]]], _?CompositeQ]]] (* Harvey P. Dale, Apr 23 2015 *)

Cf. A013916, A102863.

Sequence in context: A167707 A131903 A141114 * A247459 A020491 A168501

Adjacent sequences: A136440 A136441 A136442 * A136444 A136445 A136446

nonn

Giovanni Teofilatto, Apr 03 2008

approved