A094476 Primes of form 2^j + 17^j.

2, 19, 293, 83537

Offset

1,1

Comments

The number j must be zero or a power of 2. Checked j being powers of two through 2^20. Thus a(5) > 10^2500000. Primes of this magnitude are rare (about 1 in 5.9 million), so chance of finding one is remote with today's computer algorithms and speeds. - Robert Price, Apr 29 2013

Links

Table of n, a(n) for n=1..4.

Example

j=0: p=1+1=2;j=1: p=2+17=19;j=2: p=4+289=293;j=4: p=16+83521=83537; the j exponents are powers of 2.

Mathematica

Select[Table[2^n+17^n, {n, 0, 2000}], PrimeQ] (* Harvey P. Dale, Nov 27 2012 *)

Crossrefs

Cf. A082101, A094473-A094480.

Sequence in context: A065923 A293946 A365652 * A375860 A304637 A119773

Adjacent sequences: A094473 A094474 A094475 * A094477 A094478 A094479

Keyword

nonn

Author

Labos Elemer, Jun 01 2004

Status

approved