A072318 Smallest Fibonacci number containing exactly n 5's.

5, 55, 1548008755920, 259695496911122585, 36726740705505779255899443, 59425114757512643212875125, 8146227408089084511865756065370647467555938, 35600075545958458963222876581316753, 55835073295300465536628086585786672357234389, 1324695516964754142521850507284930515811378128425638237225

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

a(2)=55 so 55 is the smallest Fibonacci number containing exactly two 5's.

Mathematica

Module[{nn=600, tbl}, tbl=Table[{Fibonacci[f], DigitCount[Fibonacci[f], 10, 5]}, {f, nn}]; Table[SelectFirst[tbl, #[[2]]==n&], {n, 10}]][[;; , 1]] (* Harvey P. Dale, Jul 30 2025 *)

Crossrefs

Sequence in context: A045729 A067515 A289259 * A174514 A041995 A288543

Adjacent sequences: A072315 A072316 A072317 * A072319 A072320 A072321

Keyword

base,nonn

Author

Shyam Sunder Gupta, Jul 14 2002

Status

approved