A136443 Numbers m such that A102863(m) = 1.

1, 3, 5, 7, 8, 9, 10, 11, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78

Offset

1,2

Comments

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

Links

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

Mathematica

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

Crossrefs

Cf. A013916, A102863.

Sequence in context: A167707 A131903 A141114 * A247459 A020491 A168501

Adjacent sequences: A136440 A136441 A136442 * A136444 A136445 A136446

Keyword

nonn

Author

Giovanni Teofilatto, Apr 03 2008

Status

approved