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A047337
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Numbers that are congruent to {0, 1, 2, 3, 4} mod 7.
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1
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0, 1, 2, 3, 4, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 35, 36, 37, 38, 39, 42, 43, 44, 45, 46, 49, 50, 51, 52, 53, 56, 57, 58, 59, 60, 63, 64, 65, 66, 67, 70, 71, 72, 73, 74, 77, 78
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) = 7*floor((n-1)/5) + ((n-1) mod 5). - Gary Detlefs, Mar 09 2010
G.f.: x^2*(1 + x + x^2 + x^3 + 3*x^4) / ( (1 + x + x^2 + x^3 + x^4)*(x-1)^2 ). - R. J. Mathar, Dec 04 2011
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MATHEMATICA
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DeleteCases[Range[0, 80], _?(Mod[#, 7]>4&)] (* Harvey P. Dale, Aug 21 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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