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Search: id:A130650
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| 0, 0, 4, 13, 2, 13, 18, 4, 43, 8, 3, 41, 4, 4, 3, 13, 2, 37, 16, 43, 97, 4, 9, 10, 53, 4, 5, 10, 3, 6, 61, 43, 2, 11, 2, 12, 163, 8, 13, 2, 5, 173, 8, 89, 4, 3, 37, 61, 101, 101, 107, 229, 113
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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a(n) is the weight of 3-almost primes. 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..9999
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EXAMPLE
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For n = 1 we have A014612(n) = 8, A014612(n+1) = 12; there is no k such that 12 - 8 = 4 = (8 mod k), hence a(1) = 0.
For n = 3 we have A014612(n) = 18, A014612(n+1) = 20; 4 is the smallest k such that 20 - 18 = 2 = (18 mod k), hence a(3) = 4.
For n = 21 we have A014612(n) = 98, A014612(n+1) = 99; 97 is the smallest k such that 99 - 98 = 1 = (97 mod k), hence a(21) = 97.
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CROSSREFS
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Cf. A020639, A117078, A117563, A001223, A118534, A090369, A090368.
Sequence in context: A024248 A130539 A156823 this_sequence A051432 A046737 A046738
Adjacent sequences: A130647 A130648 A130649 this_sequence A130651 A130652 A130653
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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), Aug 16 2007
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