A201278 a(n) specifies the quadratic extension sqrt(a(n)) for A201047(n).

10, 2, 2, 5, 5, 130, 185, 5, 2, 2, 10, 10, 5, 5, 10, 17, 17, 5, 5, 5, 53, 53, 13, 13, 1490, 5, 2, 2, 5, 1565, 5

Offset: 1

Author

Artur Jasinski, Nov 29 2011

Keywords

• nonn
• more

Comments

Conjecture (Jasiński): The numbers in this sequence are multiplicative combinations of: primes congruent to 1 or 2 modulo 4 (A002313), Pythagorean primes (A002144), the number 2, and norms of Gaussian primes A055025.

Crossrefs

Cf. A200216, A200656, A201047.

Extensions

Minor edits by N. J. A. Sloane, Feb 23 2014