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 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS From an idea of Eric Angelini with additional terms from D. S. McNeil. The partial sums of the sequence are 2, 3, 7, 13, 16, 23, 31, 41, 52, ... The sequence is self-descriptive 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 Neal Gersh Tolunsky, Table of n, a(n) for n = 1..10000 Eric Angelini, The sum of the a(n) first digits of S is a prime Eric Angelini, The sum of the a(n) first digits of S is a prime [Cached copy, with permission] CROSSREFS Cf. A171007 (digits version), A363379 (complement). Sequence in context: A306015 A171087 A105364 * A171007 A209168 A209162 Adjacent sequences: A180402 A180403 A180404 * A180406 A180407 A180408 KEYWORD easy,nonn,changed AUTHOR Paolo P. Lava, Sep 02 2010 EXTENSIONS Examples replaced with a comment by R. J. Mathar, Nov 18 2010 STATUS approved

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Last modified June 2 20:13 EDT 2023. Contains 363100 sequences. (Running on oeis4.)