login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A044374 Numbers n such that string 4,2 occurs in the base 10 representation of n but not of n-1. 0
42, 142, 242, 342, 420, 442, 542, 642, 742, 842, 942, 1042, 1142, 1242, 1342, 1420, 1442, 1542, 1642, 1742, 1842, 1942, 2042, 2142, 2242, 2342, 2420, 2442, 2542, 2642, 2742, 2842, 2942, 3042, 3142, 3242, 3342, 3420, 3442 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {4, 2}]>0, 1, 0], {n, 3500}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 30 2018 *)

CROSSREFS

Sequence in context: A303860 A002759 A330939 * A044755 A262424 A230932

Adjacent sequences:  A044371 A044372 A044373 * A044375 A044376 A044377

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 5 09:57 EDT 2020. Contains 334834 sequences. (Running on oeis4.)