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A138141
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Numbers with digits in ascending order that differ exactly by 1.
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2
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1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 23, 34, 45, 56, 67, 78, 89, 123, 234, 345, 456, 567, 678, 789, 1234, 2345, 3456, 4567, 5678, 6789, 12345, 23456, 34567, 45678, 56789, 123456, 234567, 345678, 456789, 1234567, 2345678, 3456789, 12345678, 23456789, 123456789
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| This finite sequence has 45 members. The last member is 123456789. There are 10-k members with k digits. See A052017 for primes in this sequence. All members with 3 or more digits are stright-line numbers A135643.
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MATHEMATICA
| fQ[n_]:=Module[{id=IntegerDigits[n]}, n < 10 || Union[Differences[id]] == {1}]; Select[Range[123456789], fQ] (*From Vladimir Joseph Stephan Orlovsky (4vladimir(AT)gmail.com), 29 Dec 2010*)
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CROSSREFS
| Cf. A052017, A059043, A135643, A138142.
Sequence in context: A095160 A200372 A059043 * A001102 A051004 A032575
Adjacent sequences: A138138 A138139 A138140 * A138142 A138143 A138144
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KEYWORD
| base,easy,fini,full,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 19 2008
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