OFFSET
1,1
LINKS
H. Cohn and J. C. Lagarias, On the existence of fields governing the 2-invariants of the classgroup of Q(sqrt{dp}) as p varies, Math. Comp. 41 (1983), 711-730.
S. Louboutin, L-functions and class numbers of imaginary quadratic fields and of quadratic extensions of an imaginary quadratic field, Math. Comp. 59 (1992) 213-230, Table 1.
A. S. Mosunov and M. J. Jacobson Jr., Unconditional class group tabulation of imaginary quadratic fields to |Δ| < 2^40, Math. Comp. 85 (2016), no. 300, 1983-2009.
PROG
(SageMath)
def a(n):
for p in Primes():
if QuadraticField(-p).class_number().valuation(2)==n:
return p # Robin Visser, May 25 2024
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Feb 19 2005
EXTENSIONS
a(10)-a(17) from Robin Visser, May 25 2024
a(18)-a(19) from Robin Visser, Dec 28 2024
STATUS
approved
