A076636 a(1) = 1, a(2n) = smallest prime > (2n-1)-th partial sum of the sequence itself and a(2n+1) = smallest composite number > 2n-th partial sum of the sequence.

1, 2, 4, 11, 20, 41, 80, 163, 323, 647, 1293, 2591, 5177, 10357, 20711, 41443, 82865, 165749, 331479, 662999, 1325957, 2651947, 5303861, 10607731, 21215453, 42430919, 84861825, 169723691, 339447341, 678894751, 1357789433, 2715578891

Offset

1,2

Links

Table of n, a(n) for n=1..32.

Crossrefs

Cf. A076975.

Sequence in context: A000638 A039824 A204519 * A011954 A278446 A349566

Adjacent sequences: A076633 A076634 A076635 * A076637 A076638 A076639

Keyword

nonn

Author

Amarnath Murthy, Oct 23 2002

Extensions

More terms from Franklin T. Adams-Watters, Aug 29 2006

Status

approved