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A123483
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Second order Recaman's sequence: a(0) = 0; for n > 0, a(n) = a(n-1) - A005132(n) if that number is positive and not already in the sequence, otherwise a(n-1) + A005132(n).
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2
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0, 1, 4, 10, 8, 15, 2, 22, 34, 13, 24, 46, 36, 59, 50, 26, 18, 43, 86, 148, 106, 169, 128, 110, 68, 51, 94, 78, 122, 107, 62, 48, 94, 173, 60, 138, 252, 175, 136, 58, 20, 99, 136, 56, 92, 11, 46, 128, 162, 79, 112, 28, 60, 145, 114, 200, 170, 83, 54, 142, 170, 81, 108, 198
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| I conjecture that this sequence contains every natural number. (Even though through n=10000, we still haven't seen 3; we are still occasionally seeing small numbers.) This sequence has an interesting graph.
The smallest n such that a(n) = 3, 6, 12 are, respectively, 4729925, 5808155, 2093396. The following numbers less than 100 do not appear in the sequence for n <= 10^7: 7, 17, 19, 21, 23, 25, 27, 29, 35, 39, 41, 44, 45, 57, 61, 65, 67, 70, 71, 73, 77, 87, 91, 95. - Nick Hobson (nickh(AT)qbyte.org), Feb 18 2007
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LINKS
| Franklin T. Adams-Watters, The first 10000 terms
Nick Hobson, Python program for this sequence
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CROSSREFS
| Cf. A005132.
Sequence in context: A014476 A080362 A070295 * A073722 A199805 A053248
Adjacent sequences: A123480 A123481 A123482 * A123484 A123485 A123486
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KEYWORD
| nonn
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AUTHOR
| Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Sep 28 2006
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