OFFSET
1,1
COMMENTS
For these primes p, the binary expansion of 1/p has a unique period length. The binary analog of A007615.
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..179 (terms for n=1..100 from T. D. Noe)
MATHEMATICA
Reap[Do[c=Cyclotomic[n, 2]; q=c/GCD[c, n]; If[PrimePowerQ[q], Sow[FactorInteger[q][[1, 1]]]], {n, 100}]][[2, 1]]
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Jun 17 2009
STATUS
approved