a(n) is the smallest prime p > k such that p + k is a power of 2, where k = 2*n - 1, or 0 if no such prime exists.
A343738
a(n) is the smallest prime p > k such that p + k is a power of 2, where k = 2*n - 1, or 0 if no such prime exists.
Terms
- a(0) =3a(1) =5a(2) =11a(3) =549755813881a(4) =23a(5) =53a(6) =19a(7) =17a(8) =47a(9) =109a(10) =43a(11) =41a(12) =103a(13) =37a(14) =227a(15) =97a(16) =223a(17) =16349a(18) =2011a(19) =89a(20) =983a(21) =536870869a(22) =83a(23) =977a(24) =79a(25) =461a(26) =971a(27) =73a(28) =71a(29) =197
External references
- oeis: A343738