Whilst working on another project, I noticed a sequence of primes given by
the following pari/gp script:
i = (j*12)+9;
p = 7 + ((2^i-1)*16);
if(l == 1,
where p/7 is prime for j = 1, 6, 9, 13, 18, 20, 103, 151 and 1206
My question is, is it likely that this sequence is extendable or is it
likely to be finite?
I've put a fair number of cycles into this, but was unable to find
anything with j > 1206 as yet.