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A138142
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Nonnegative numbers with digits in descending order that differ exactly by 1.
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2
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 32, 43, 54, 65, 76, 87, 98, 210, 321, 432, 543, 654, 765, 876, 987, 3210, 4321, 5432, 6543, 7654, 8765, 9876, 43210, 54321, 65432, 76543, 87654, 98765, 543210, 654321, 765432, 876543, 987654
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| This finite sequence has 55 members. The last member is 9876543210. There are 11-k members with k digits. See A052016 for primes in this sequence. All members with 3 or more digits are stright-line numbers A135643.
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EXAMPLE
| Last 10 members of this finite sequence:
a(45)=6543210
a(46)=7654321
a(47)=8765432
a(48)=9876543
a(49)=76543210
a(50)=87654321
a(51)=98765432
a(52)=876543210
a(53)=987654321
a(54)=9876543210
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MATHEMATICA
| fQ[n_]:=Module[{id=IntegerDigits[n]}, n<10 || Union[Differences[id]]=={-1}]; Select[Range[0, 100000], fQ] (*From Vladimir Joseph Stephan Orlovsky (4vladimir(AT)gmail.com), 29 Dec 2010*)
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CROSSREFS
| Cf. A052016, A135643, A138141.
Sequence in context: A068860 A158699 A061511 * A085890 A134817 A067581
Adjacent sequences: A138139 A138140 A138141 * A138143 A138144 A138145
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KEYWORD
| base,easy,fini,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 19 2008
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EXTENSIONS
| Corrected examples. - Omar E. Pol (info(AT)polprimos.com), Dec 06 2008
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