

A180405


Smallest integer not yet present in the sequence such that the sum of the first a(n) terms of the sequence is a prime.


1



2, 1, 4, 6, 3, 7, 8, 10, 11, 15, 12, 18, 14, 16, 22, 24, 19, 31, 28, 20, 23, 37, 36, 30, 26, 34, 29, 35, 42, 38, 40, 32, 39, 45, 52, 44, 54, 46, 56, 60, 43, 51, 50, 64, 84, 48, 49, 53, 68, 58, 62, 78, 70, 66, 57, 59, 82, 92, 90, 88, 63, 77, 72, 94, 67, 79, 76, 102, 71, 81, 96, 100
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OFFSET

1,1


COMMENTS

The partial sums of the sequence are 2, 3, 7, 13, 16, 23, 31, 41, 52, ...
The sequence is selfdescriptive and says that the 2nd, 1st, 4th, 6th, 3rd, 7th, etc, term in the partial sums, namely 3, 2, 13, 23, 7, 31 etc, are primes.


LINKS



CROSSREFS



KEYWORD

easy,nonn,changed


AUTHOR



EXTENSIONS

Examples replaced with a comment by R. J. Mathar, Nov 18 2010


STATUS

approved



