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Search: id:A082928
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| A082928 |
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If n is prime, a(n) = n+1; if n is even, a(n) = n/2; otherwise a(n) = n. |
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+0
2
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| 1, 3, 4, 2, 6, 3, 8, 4, 9, 5, 12, 6, 14, 7, 15, 8, 18, 9, 20, 10, 21, 11, 24, 12, 25, 13, 27, 14, 30, 15, 32, 16, 33, 17, 35, 18, 38, 19, 39, 20, 42, 21, 44, 22, 45, 23, 48, 24, 49, 25, 51, 26, 54, 27, 55, 28, 57, 29, 60, 30, 62, 31, 63, 32, 65, 33, 68, 34, 69, 35, 72, 36, 74, 37
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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seq = if n even then n/2 else n. seq = if n is prime then n+1. Sumseq = Sumseq + seq for n=1, 2, ...
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PROGRAM
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(PARI) a(n)={if(isprime(n), n+1, if(n%2, n, n/2))}
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CROSSREFS
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Sequence in context: A133620 A154570 A145961 this_sequence A139524 A108127 A049277
Adjacent sequences: A082925 A082926 A082927 this_sequence A082929 A082930 A082931
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), May 26 2003
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EXTENSIONS
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Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Oct 09 2009
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