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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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A193064 Primes p for which there is no prime q == 2 (mod 3) that is smaller than p and is a quadratic residue modulo p.

Original entry on oeis.org

2, 3, 5, 13
Offset: 1

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Author

Jonathan Sondow, Jul 15 2011

Keywords

Comments

Gica proved that if p is a prime different from 2, 3, 5, 13, then a prime q < p exists which is a quadratic residue modulo p and q == 2 (mod 3). His paper has not yet been published, but see A192578 for a reference, link, and examples of a similar result.

Crossrefs

Cf. A192578, A192579, A193063.
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