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Search: id:A133151
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| 0, 0, 0, 0, 19, 32, 24, 67, 89, 38, 71, 173, 69, 61, 71, 109, 373, 211, 79, 529, 587, 72, 89, 779, 283, 461, 499, 359, 1159, 311, 111, 1423, 1517, 269, 857, 1817, 641, 127, 134, 251, 2377, 1249, 138, 2749, 2879, 251, 787, 173, 381, 1787, 1861, 1291
(list; graph; listen)
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OFFSET
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1,5
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COMMENT
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a(n) is the weight of pentagonal numbers (A000326). A020639(n) is the weight of natural numbers. A117078(n) is the weight of primes numbers.
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LINKS
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Remi Eismann, Table of n, a(n) for n = 1..1000
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EXAMPLE
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For n = 1 we have A000326(n) = 1, A000326(n+1) = 5; there is no k such that 5 - 1 = 4 = (1 mod k), hence a(1) = 0.
For n = 5 we have A000326(n) = 35, A000326(n+1) = 51; 19 is the smallest k such that 51 - 35 = 16 = (35 mod k), hence a(5) = 19.
For n = 18 we have A000326(n) = 477, A000326(n+1) = 532; 211 is the smallest k such that 532 - 477 = 55 = (477 mod k), hence a(18) = 211.
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CROSSREFS
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Cf. A020639, A117078, A117563, A001223, A118534, A090369, A090368, A130533, A130650, A130703, A130889, A130882.
Sequence in context: A147210 A146816 A146659 this_sequence A101063 A061962 A116168
Adjacent sequences: A133148 A133149 A133150 this_sequence A133152 A133153 A133154
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KEYWORD
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nonn
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AUTHOR
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Remi Eismann (reismann(AT)free.fr), Sep 22 2007
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