OFFSET
1,2
COMMENTS
These numbers are prime powers, members of A000961.
LINKS
Ray Chandler, Table of n, a(n) for n = 1..1000
MATHEMATICA
myPerfectPowerQ[n_] := Length[FactorInteger[n]] == 1; t=Select[Prime[Range[500]], Mod[10, #] > 0 && myPerfectPowerQ[Length[RealDigits[1/#, 10][[1, 1]]]] &]; Table[Length[RealDigits[1/n, 10][[1, 1]]], {n, t}]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
T. D. Noe, Oct 22 2011
STATUS
approved