A243139 a(n) = 2^prime(n) + prime(n).

6, 11, 37, 135, 2059, 8205, 131089, 524307, 8388631, 536870941, 2147483679, 137438953509, 2199023255593, 8796093022251, 140737488355375, 9007199254741045, 576460752303423547, 2305843009213694013, 147573952589676412995, 2361183241434822606919

Offset: 1

Author

Vincenzo Librandi, Jun 03 2014

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..200
• J. Mestel, Archimedeans Problems Drive 1977, Eureka, 39 (1978), 38-40. (Annotated scanned copy)

Crossrefs

Cf. A034785, A100105.

Programs

Magma

[2^p + p: p in PrimesUpTo(80)];

Mathematica

f[n_]:=(2^Prime[n] + Prime[n]); Array[f, 80, 1]