A133315 Positive discriminants with form class number 1.

5, 8, 12, 13, 17, 20, 21, 24, 28, 29, 32, 33, 37, 41, 44, 45, 48, 52, 53, 56, 57, 61, 68, 69, 72, 73, 76, 77, 80, 84, 88, 89, 92, 93, 97, 101, 108, 109, 112, 113, 116, 117, 124, 125, 128, 129, 132, 133, 137, 141, 149, 152, 153, 157, 161, 164, 172, 173, 176, 177, 180, 181, 184, 188, 189, 193, 197, 201, 208

Offset: 1

Author

David Brink, Dec 30 2007

Keywords

• nonn

References

• D. A. Cox, Primes of the form x^2+ny^2, Wiley, New York, 1989.
• D. E. Flath, Introduction to Number Theory, Wiley-Interscience, 1989.

Programs

PARI

isA133315 (n) = (n % 4 <= 1) && (! issquare(n)) && (qfbclassno(n, 1) == 1) \\ Michel Marcus, May 23 2013