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A080900
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a(1)=1; for n>1, a(n)=a(n-1)-2 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.
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13
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1, 6, 11, 16, 21, 19, 24, 29, 34, 39, 37, 42, 47, 52, 57, 55, 60, 65, 63, 68, 66, 71, 76, 74, 79, 84, 89, 94, 92, 97, 102, 107, 112, 110, 115, 120, 118, 123, 121, 126, 131, 129, 134, 139, 144, 149, 147, 152, 157, 162, 167, 165, 170, 175, 173, 178, 176
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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
| Perhaps this is asymptotic to c_0*n*(1 + c_1/log n + ...), with c_0 near 2 ?
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CROSSREFS
| Cf. A080912, A080913, A080904, A080914, A080578, A080919, A080922, A080927.
Cf. A080901 (starting value = 2).
Sequence in context: A070397 A080904 A081746 * A080783 A016861 A145287
Adjacent sequences: A080897 A080898 A080899 * A080901 A080902 A080903
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com) and Benoit Cloitre, Apr 01 2003
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