A070232 a(1) = 4; a(n) = smallest composite number greater than the sum of all previous terms.

4, 6, 12, 24, 48, 95, 190, 380, 760, 1520, 3040, 6080, 12160, 24320, 48640, 97280, 194560, 389120, 778240, 1556480, 3112960, 6225920, 12451840, 24903680, 49807360, 99614720, 199229440, 398458880, 796917760, 1593835520, 3187671040

Offset

1,1

Comments

a(n) = 95*2^(n-6) for n > 5.

Links

Table of n, a(n) for n=1..31.

Mathematica

a = {4}; Do[b = 1 + Plus @@ a; While[ PrimeQ[b], b++ ]; a = Append[a, b], {n, 2, 30}]; a

Crossrefs

Cf. A070218.

Sequence in context: A162688 A362883 A352634 * A037100 A095969 A090608

Adjacent sequences: A070229 A070230 A070231 * A070233 A070234 A070235

Keyword

nonn

Author

Amarnath Murthy, May 05 2002

Extensions

Edited by Robert G. Wilson v, May 06 2002

Status

approved