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Search: id:A074993
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| A074993 |
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Floor[concatenation of n, n+1 divided by 2]. |
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+0
10
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| 0, 6, 11, 17, 22, 28, 33, 39, 44, 455, 505, 556, 606, 657, 707, 758, 808, 859, 909, 960, 1010, 1061, 1111, 1162, 1212, 1263, 1313, 1364, 1414, 1465, 1515, 1566, 1616, 1667, 1717, 1768
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The first differences follow a pattern. Odd indexed terms and even indexed terms form separate A.P.s with the same common difference for all n except n = 10^k -1.The corresponding common differences are the repunits = {10^(d+1)-1}/9 where d = the number of digits in n.
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CROSSREFS
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Cf. A074991, A074992, A074994, A074995, A074996, A074997, A073086, A074999.
Sequence in context: A118847 A111256 A001964 this_sequence A063901 A126620 A109330
Adjacent sequences: A074990 A074991 A074992 this_sequence A074994 A074995 A074996
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 31 2002
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