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A243139
a(n) = 2^prime(n) + prime(n).
1
6, 11, 37, 135, 2059, 8205, 131089, 524307, 8388631, 536870941, 2147483679, 137438953509, 2199023255593, 8796093022251, 140737488355375, 9007199254741045, 576460752303423547, 2305843009213694013, 147573952589676412995, 2361183241434822606919
OFFSET
1,1
LINKS
J. Mestel, Archimedeans Problems Drive 1977, Eureka, 39 (1978), 38-40. (Annotated scanned copy)
MATHEMATICA
f[n_]:=(2^Prime[n] + Prime[n]); Array[f, 80, 1]
PROG
(Magma) [2^p + p: p in PrimesUpTo(80)];
CROSSREFS
Sequence in context: A108698 A002570 A038265 * A288822 A015440 A253209
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Jun 03 2014
STATUS
approved