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Search: id:A080645
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| A080645 |
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a(1) = 1; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) which is consistent with the condition "for n>1, if n is a member of the sequence then a(n) is even". |
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+0
1
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| 1, 2, 4, 6, 7, 8, 10, 12, 13, 14, 15, 16, 18, 20, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 36, 38, 40, 42, 44, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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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)
Index entries for sequences of the a(a(n)) = 2n family
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FORMULA
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a(1)=1, a(2)=2, a(3)=4; then for k>=1, abs(j)<=2^k: a(3*2^k+j)=4*2^k+3/2*j+abs(j)/2.
{a(a(n))} = {1, 2, 2i, i >= 3}.
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CROSSREFS
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Cf. A080639, A080640, A079000.
Essentially the same as A007378.
Sequence in context: A121538 A026510 A138204 this_sequence A024413 A047237 A039028
Adjacent sequences: A080642 A080643 A080644 this_sequence A080646 A080647 A080648
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KEYWORD
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nonn,easy
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AUTHOR
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njas and Benoit Cloitre, Feb 28 2003
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