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Search: id:A127422
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| A127422 |
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Numbers whose decimal expansion is a concatenation of 3 consecutive increasing numbers. |
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+0
1
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| 12, 123, 234, 345, 456, 567, 678, 789, 8910, 91011, 101112, 111213, 121314, 131415, 141516, 151617, 161718, 171819, 202122, 212223, 222324, 232425, 242526, 252627
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=(n-1)*10^floor[log10(b)+1]+b, with b=n*10^floor[log10(n+1)+1]+n+1 and n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Aug 04 2008]
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MAPLE
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(Maple) P:=proc(i) local a, b, c, n; for n from 1 by 1 to i do b:=n*10^evalf(floor(log10(n+1)+1))+n+1; a:=floor((n-1)*10^evalf(floor(log10(b)+1))+b); print(a); od; end: P(1000); [From Paolo P. Lava (ppl(AT)spl.at), Aug 04 2008]
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CROSSREFS
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Cf. A127421-A127430.
Sequence in context: A113574 A078189 A167208 this_sequence A163574 A079847 A144165
Adjacent sequences: A127419 A127420 A127421 this_sequence A127423 A127424 A127425
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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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