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Search: id:A160180
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| A160180 |
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The nth positive composite number divided by its lowest non-trivial factor. |
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+0
2
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| 2, 3, 4, 3, 5, 6, 7, 5, 8, 9, 10, 7, 11, 12, 5, 13, 9, 14, 15, 16, 11, 17, 7, 18, 19, 13, 20, 21, 22, 15, 23, 24, 7, 25, 17, 26, 27, 11, 28, 19, 29, 30, 31, 21, 32, 13, 33, 34, 23, 35, 36, 37, 25, 38, 11, 39, 40, 27, 41, 42, 17, 43, 29, 44, 45, 13, 46, 31, 47, 19, 48, 49, 33, 50, 51, 52
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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K. Stern, Table of n, a(n) for n=1..9999
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EXAMPLE
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a(1) = 4/2 = 2, a(2) = 6/2 = 3, a(3) = 8/2 = 4, a(4) = 9/3 = 3, a(5) = 10/2 = 5
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PROGRAM
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(Other) %% Matlab code to generate sequence of first k terms
function [a] = A160180(k) j = 0; n = 1; while j < k if isprime(n) == 1 skip elseif isprime(n) == 0 j = j + 1; factors = factor(n); lowfactor = factors(1, 1); a(j, 1) = n/lowfactor; end n = n + 1; end [From Kyle Stern (kstern1(AT)umbc.edu), May 04 2009]
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CROSSREFS
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Sequence in context: A054437 A159630 A141128 this_sequence A078908 A159797 A152920
Adjacent sequences: A160177 A160178 A160179 this_sequence A160181 A160182 A160183
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KEYWORD
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easy,nonn
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AUTHOR
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Kyle Stern (kstern1(AT)umbc.edu), May 03 2009, May 04 2009
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EXTENSIONS
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Indices of b-file corrected, more terms added using b-file. - N. J. A. Sloane, Aug 31 2009
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