A202053 Class number of sqrt(n).

1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 3, 1, 1, 4, 1, 1, 2, 1

Offset

1,10

Links

Robert G. Wilson v, Table of n, a(n) for n = 1..10000 (first 1000 terms from T. D. Noe)

Eric W. Weisstein, MathWorld: Class Number

Wikipedia, Class number formula

Mathematica

Table[NumberFieldClassNumber[Sqrt[d]], {d, 100}]

Crossrefs

Cf. A202084 (class number of sqrt(-n)).

Sequence in context: A106752 A136441 A030561 * A334184 A249545 A296081

Adjacent sequences: A202050 A202051 A202052 * A202054 A202055 A202056

Keyword

nonn

Author

Artur Jasinski, Dec 11 2011

Status

approved