

A138141


Numbers with digits in ascending order that differ exactly by 1.


3



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
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OFFSET

1,2


COMMENTS

This finite sequence has 45 members. The last member is 123456789. There are 10k members with k digits. See A052017 for primes in this sequence. All members with 3 or more digits are straightline numbers A135643.


LINKS

Table of n, a(n) for n=1..45.


MATHEMATICA

fQ[n_]:=Module[{id=IntegerDigits[n]}, n < 10  Union[Differences[id]] == {1}]; Select[Range[123456789], fQ] (* Vladimir Joseph Stephan Orlovsky, Dec 29 2010 *)
Table[FromDigits/@Partition[Range[9], n, 1], {n, 9}]//Flatten (* Harvey P. Dale, Mar 19 2017 *)


CROSSREFS

Cf. A052017, A059043, A135643, A138142.
Sequence in context: A200372 A059043 A259236 * A228017 A227224 A236750
Adjacent sequences: A138138 A138139 A138140 * A138142 A138143 A138144


KEYWORD

base,easy,fini,full,nonn


AUTHOR

Omar E. Pol, Mar 19 2008


STATUS

approved



