| 0, 1, 2, 1, 4, 5, 2, 7, 8, 3, 10, 11, 4, 13, 14, 5, 16, 17, 6, 19, 20, 7, 22, 23, 8, 25, 26, 9, 28, 29, 10, 31, 32, 11, 34, 35, 12, 37, 38, 13, 40, 41, 14, 43, 44, 15, 46, 47, 16, 49, 50, 17, 52, 53, 18, 55, 56, 19, 58, 59, 20, 61, 62, 21, 64, 65, 22, 67
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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n / GCD(n,3). Cf. A026741, A051176, A060819, A060791, A060789 for n / GCD(n,k) for k=2..6.
Multiplicative with a(3^e) = 3^(e-1), a(p^e) = p^e otherwise. Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu) Jun 09, 2005.
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FORMULA
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G.f.: (x^5+2x^4+x^3+2x^2+x)/(1-x^3)^2. - Len Smiley (smiley(AT)math.uaa.alaska.edu), Apr 30 2001
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CROSSREFS
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Cf. A026741, A060791, A060789.
Sequence in context: A072012 A038502 A106610 this_sequence A038719 A125751 A099492
Adjacent sequences: A051173 A051174 A051175 this_sequence A051177 A051178 A051179
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KEYWORD
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nonn,easy,mult
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AUTHOR
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njas
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