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A044416 Numbers n such that string '84' occurs in the base 10 representation of n but not of n-1. 0
84, 184, 284, 384, 484, 584, 684, 784, 840, 884, 984, 1084, 1184, 1284, 1384, 1484, 1584, 1684, 1784, 1840, 1884, 1984, 2084, 2184, 2284, 2384, 2484, 2584, 2684, 2784, 2840, 2884, 2984, 3084, 3184, 3284, 3384, 3484, 3584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[4000], MemberQ[Partition[IntegerDigits[#], 2, 1], {8, 4}]&&!MemberQ[Partition[IntegerDigits[#-1], 2, 1], {8, 4}]&]  (* Harvey P. Dale, Mar 14 2011 *)

Select[Range[4000], !StringFreeQ[ToString[#], "84"]&&StringFreeQ[ToString[#-1], "84"]&]

(* Zak Seidov Mar 14 2011 *)

CROSSREFS

Sequence in context: A295596 A287118 A306514 * A044797 A072589 A181113

Adjacent sequences:  A044413 A044414 A044415 * A044417 A044418 A044419

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 26 17:19 EST 2020. Contains 332293 sequences. (Running on oeis4.)