A044783 Numbers n such that string 7,0 occurs in the base 10 representation of n but not of n+1.

70, 170, 270, 370, 470, 570, 670, 709, 770, 870, 970, 1070, 1170, 1270, 1370, 1470, 1570, 1670, 1709, 1770, 1870, 1970, 2070, 2170, 2270, 2370, 2470, 2570, 2670, 2709, 2770, 2870, 2970, 3070, 3170, 3270, 3370, 3470, 3570

Offset

1,1

Comments

Numbers whose base 10 representations end in the regular expression 709* and contain no other 70. - Robert Israel, Feb 24 2016

Links

Georg Fischer, Table of n, a(n) for n = 1..10000

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {7, 0}]>0, 1, 0], {n, 3600}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 07 2019 *)

Crossrefs

Cf. A044402.

Sequence in context: A063320 A255793 A044402 * A278782 A154361 A165762

Adjacent sequences: A044780 A044781 A044782 * A044784 A044785 A044786

Keyword

nonn,base

Author

Clark Kimberling

Extensions

b-file corrected by Georg Fischer, Jun 27 2019

Status

approved