[seqfan] 2^k - prime(p) or prime(p) - 2^k ?

[юрий герасимов]

Hello, SegFans, 
Primes p of the form 2^k - prime(p) for some k:  3, 5, 503,...? 
or 
Primes p of the form prime(p) - 2^k for some  k:  2, 3,...? 
Best regards, JSG.