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Search: id:A068626
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| A068626 |
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a(3n) = a(3n-1) = 3*n^2, a(3n-2) = 3*n^2 - 3*n + 1. |
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+0
5
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| 1, 3, 3, 7, 12, 12, 19, 27, 27, 37, 48, 48, 61, 75, 75, 91, 108, 108, 127, 147, 147, 169, 192, 192, 217, 243, 243, 271, 300, 300, 331, 363, 363, 397, 432, 432, 469, 507, 507, 547, 588, 588, 631, 675, 675, 721, 768, 768, 817, 867, 867, 919, 972, 972, 1027, 1083, 1083, 1141
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Or, a(1) = 1, a(n) = n + a(n-1) if n does not divide a(n-1) else a(n) = a(n-1). E.g. a(6) = a(5) = 12 as 6 divides 12. a(10) =10 +a(9) 10+27 =37.
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LINKS
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B. D. Swan, Table of n, a(n) for n=1,...,90000
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CROSSREFS
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Sequence in context: A036056 A161815 A006661 this_sequence A126698 A088859 A116880
Adjacent sequences: A068623 A068624 A068625 this_sequence A068627 A068628 A068629
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 26 2002
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EXTENSIONS
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Entry revised by N. J. A. Sloane (njas(AT)research.att.com), Mar 13 2006.
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