A216578 Prime numbers which cannot be written in the form x^2 + 10*y^2.

2, 3, 5, 7, 13, 17, 23, 29, 31, 37, 43, 47, 53, 61, 67, 71, 73, 79, 83, 97, 101, 103, 107, 109, 113, 127, 137, 149, 151, 157, 163, 167, 173, 181, 191, 193, 197, 199, 223, 227, 229, 233, 239, 257, 263, 269, 271, 277, 283, 293, 307, 311, 313, 317, 337, 347

Offset

1,1

Comments

Prime numbers not congruent to {1, 9, 11, 19} mod 40.

Links

Table of n, a(n) for n=1..56.

Crossrefs

Cf. A020673, A033201.

Sequence in context: A305352 A347864 A137812 * A094317 A074834 A163998

Adjacent sequences: A216575 A216576 A216577 * A216579 A216580 A216581

Keyword

nonn

Author

V. Raman, Sep 08 2012

Status

approved