OFFSET
1,1
COMMENTS
a(14) > 10^5. - Michael S. Branicky, Sep 13 2024
EXAMPLE
2^(2*17-27)-27=101, 2^(2*23-27)-27=524261, 2^(2*25-27)-27=8388581, ...
MATHEMATICA
q=27; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 20^2}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
Select[Range[1000], PrimeQ[Abs[2^(2#-27)-27]]&] (* Harvey P. Dale, Nov 12 2015 *)
PROG
(PARI) is(n)=ispseudoprime(abs(2^(2*n-27)-27)) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, May 13 2008
EXTENSIONS
STATUS
approved