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Search: id:A080704
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| A080704 |
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a(1)=2; for n>1, if n is in the sequence then a(n) is the smallest even integer >a(n-1), otherwise a(n)=a(n-1)+3. |
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3
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| 2, 4, 7, 8, 11, 14, 16, 18, 21, 24, 26, 29, 32, 34, 37, 38, 41, 42, 45, 48, 50, 53, 56, 58, 61, 62, 65, 68, 70, 73, 76, 78, 81, 82, 85, 88, 90, 92, 95, 98, 100, 102, 105, 108, 110, 113, 116, 118, 121, 122, 125, 128, 130, 133, 136, 138, 141, 142, 145, 148
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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It seems that a(n)/n ->2.4799....=62/25 ?
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PROGRAM
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(PARI) for(n=2, 400, an[n]=if(setsearch(Set(vector(n-1, i, a(i))), n), if(a(n-1)%2, a(n-1)+1, a(n-1)+2), a(n-1)+3))
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CROSSREFS
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Cf. A080705, A064437, A080717.
Sequence in context: A093696 A074204 A030355 this_sequence A162158 A018552 A030773
Adjacent sequences: A080701 A080702 A080703 this_sequence A080705 A080706 A080707
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KEYWORD
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nonn,easy
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AUTHOR
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Benoit Cloitre, Mar 01, 2003
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