A332379 Numbers of the form 3^k + prime, with k > 1.

11, 12, 14, 16, 20, 22, 26, 28, 29, 30, 32, 34, 38, 40, 44, 46, 50, 52, 56, 58, 62, 64, 68, 70, 74, 76, 80, 82, 83, 84, 86, 88, 92, 94, 98, 100, 104, 106, 110, 112, 116, 118, 122, 124, 128, 130, 134, 136, 140, 142, 146, 148, 152, 154, 158, 160, 164, 166, 170, 172, 176, 178, 182, 184, 188, 190, 194, 200

Offset: 1

Author

N. J. A. Sloane, Feb 14 2020

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..10000
• Christian Elsholtz, Florian Luca, and Stefan Planitzer, Romanov type problems, The Ramanujan Journal 47.2 (2018): 267-289.

Crossrefs

Cf. A218044.

Programs

Maple

q:= n-> ormap(k-> isprime(n-3^k), [$2..ilog[3](n)]):
select(q, [$1..200])[];  # Alois P. Heinz, Feb 14 2020