cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Original entry on oeis.org

23, 443, 194483
Offset: 1

Views

Author

Giovanni Teofilatto, Mar 14 2010

Keywords

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]

Crossrefs

Cf. A057726, A152589.

Extensions

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