A174262 Primes of the form 21^(2^n) + 2.

23, 443, 194483

Offset

1,1

Comments

a(n) is congruent 3 mod 4.

The next term (if it exists) corresponds to some n>23, so it has more than 11 million digits. [R. J. Mathar, Aug 23 2010]

Links

Table of n, a(n) for n=1..3.

Crossrefs

Cf. A057726, A152589.

Sequence in context: A203147 A158453 A291128 * A174425 A076068 A062273

Adjacent sequences: A174259 A174260 A174261 * A174263 A174264 A174265

Keyword

nonn,bref

Author

Giovanni Teofilatto, Mar 14 2010

Extensions

Entries checked. - R. J. Mathar, Aug 23 2010

Status

approved