OFFSET
1,1
COMMENTS
I have found no primes less than the 10^7th prime where an even power of 2 results in the two prime forms above simultaneously except for 2^2 and p=13.
MATHEMATICA
f[n_] := Block[{k = 1}, While[ !PrimeQ[k] || !PrimeQ[(k - 1)/2^n] || !PrimeQ[2^n*k + 1], k += 2^n]; k]; Table[ f[n], {n, 1, 37, 2}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Jul 26 2003
STATUS
approved