Number of composite numbers around 4^n.
1, 3, 5, 5, 9, 5, 29, 15, 7, 9, 17, 45, 19, 59, 37, 19, 65, 35, 51, 101, 25, 23, 35, 79, 81, 67, 191, 85, 95, 125, 191, 71, 13, 55, 59, 107, 71, 29, 17, 77, 65, 37, 61, 305, 165, 107, 131, 77, 57, 291, 299, 127, 215, 91, 47, 99, 53, 35, 29, 569, 279, 125, 143
1
T. D. Noe, Plot of 1000 terms
T. D. Noe, Table of 1000 terms
(Mma) Table[NextPrime[4^n] - NextPrime[4^n, -1] - 1, {n, 50}]
nonn
T. D. Noe, Mar 09 2015