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A061891
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a(0)=1; for n>0, a(n)=a(n-1) if n is already in the sequence, a(n)=a(n-1)+3 otherwise.
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0
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1, 1, 4, 7, 7, 10, 13, 13, 16, 19, 19, 22, 25, 25, 28, 31, 31, 34, 37, 37, 40, 43, 43, 46, 49, 49, 52, 55, 55, 58, 61, 61, 64, 67, 67, 70, 73, 73, 76, 79, 79, 82, 85, 85, 88, 91, 91, 94, 97, 97, 100, 103, 103, 106, 109, 109, 112, 115, 115, 118, 121, 121, 124
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence, J. Integer Seqs., Vol. 6 (2003), #03.2.2.
B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence (math.NT/0305308)
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FORMULA
| a(n) = 2n-1 if n==1 (mod 3), 2n if n == 2 (mod 3), 2n+1 if n == 0 (mod 3).
Differences are periodic with period 3.
a(n)=sum{k=0..n}{(1/3)*(2*(n mod 3)-((n+1) mod 3)+5*((n+2) mod 3))}-2 - Paolo P. Lava (paoloplava(AT)gmail.com), Jun 25 2007
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CROSSREFS
| Cf. A080578.
Sequence in context: A159919 A131432 A088744 * A168074 A194121 A063194
Adjacent sequences: A061888 A061889 A061890 * A061892 A061893 A061894
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com) and Benoit Cloitre, Apr 01 2003
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