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A047204
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Numbers that are congruent to {3, 4} mod 5.
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20
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3, 4, 8, 9, 13, 14, 18, 19, 23, 24, 28, 29, 33, 34, 38, 39, 43, 44, 48, 49, 53, 54, 58, 59, 63, 64, 68, 69, 73, 74, 78, 79, 83, 84, 88, 89, 93, 94, 98, 99, 103, 104, 108, 109, 113, 114, 118, 119, 123, 124, 128, 129, 133, 134, 138, 139, 143, 144, 148, 149
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also numbers that cannot be expressed as the sum of two 4th powers. - Cino Hilliard (hillcino368(AT)gmail.com), Nov 23 2003
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).
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FORMULA
| a(n)=5*n-a(n-1)-3 (with a(1)=3) [From Vincenzo Librandi, Nov 18 2010]
G.f. x*(3+x+x^2) / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Oct 08 2011
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MATHEMATICA
| Select[Range[0, 200], MemberQ[{3, 4}, Mod[#, 5]] &] (* From Vladimir Joseph Stephan Orlovsky, Feb 12 2012 *)
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PROG
| (PARI) a(n)=(n-1)\2*5+4-n%2 \\ Charles R Greathouse IV, Dec 22 2011
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CROSSREFS
| Sequence in context: A135135 A058593 A191285 * A050035 A046974 A177986
Adjacent sequences: A047201 A047202 A047203 * A047205 A047206 A047207
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KEYWORD
| nonn,easy,changed
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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