OFFSET
1,2
COMMENTS
Record values are given by A194600.
MATHEMATICA
a[n_]:= (k=0; While[!PrimeQ[n*2^k-1] && !PrimeQ[n*2^k+1], k++]; k); w = {1}; v = {0}; Do[If[a[n]>v[[-1]], AppendTo[v, a[n]]; Print[n]], {n, 1356000000}] (* Farideh Firoozbakht, Oct 16 2014 *)
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Max Alekseyev, Oct 14 2012
EXTENSIONS
a(23)=A194639(22) from Wilfrid Keller, added by Max Alekseyev, Oct 18 2014
STATUS
approved