OFFSET
1,19
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
n=127: the period={3,1,2,2,7,11,7,2,2,1,3,22},
distinct-primes={2,3,7,11}, so a[127]=4;
MATHEMATICA
{te=Table[0, {m}], u=1}; Do[s=Count[PrimeQ[Union[Last[ContinuedFraction[n^(1/2)]]]], True]; te[[u]]=s; u=u+1, {n, 1, m}]; te
dpcf[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 0, Count[Union[ ContinuedFraction[ s][[2]]], _?PrimeQ]]]; Array[dpcf, 110] (* Harvey P. Dale, Mar 18 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jun 29 2004
STATUS
approved