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Search: id:A127423
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| A127423 |
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a(1) = 1; for n>1, a(n) = n concatenated with n-1. |
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+0
1
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| 1, 21, 32, 43, 54, 65, 76, 87, 98, 109, 1110, 1211, 1312, 1413, 1514, 1615, 1716, 1817, 1918, 2019, 2120, 2221, 2322, 2423, 2524, 2625, 2726, 2827, 2928, 3029, 3130, 3231, 3332, 3433, 3534, 3635, 3736, 3837, 3938, 4039, 4140, 4241, 4342, 4443, 4544, 4645
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(13)=1211 because 12 and 11 are two consecutive decreasing numbers
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MAPLE
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c2:=proc(x, y) local s: s:=proc(m) nops(convert(m, base, 10)) end: x*10^s(y)+y: end: seq(c2(n, n-1), n=1..53); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 07 2007
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CROSSREFS
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Cf. A127421-A127430.
Sequence in context: A095994 A118866 A118535 this_sequence A035137 A075110 A036382
Adjacent sequences: A127420 A127421 A127422 this_sequence A127424 A127425 A127426
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KEYWORD
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nonn,base
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Jan 14 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 07 2007
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