Primes -p+2^n with smallest p prime, arising in A057674.

Terms

a(0) =-3a(1) =2a(2) =5a(3) =13a(4) =29a(5) =61a(6) =109a(7) =251a(8) =509a(9) =1021a(10) =2029a(11) =4093a(12) =8179a(13) =16381a(14) =32749a(15) =65519a(16) =131059a(17) =262139a(18) =524269a(19) =1048573a(20) =2097133a(21) =4194301a(22) =8388571a(23) =16777213a(24) =33554371a(25) =67108859a(26) =134217649a(27) =268435367a(28) =536870909a(29) =1073741783