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A202053 Class number of sqrt(n). 2
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 (list; graph; refs; listen; history; text; internal format)
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
MATHEMATICA
Table[NumberFieldClassNumber[Sqrt[d]], {d, 100}]
CROSSREFS
Cf. A202084 (class number of sqrt(-n)).
Sequence in context: A106752 A136441 A030561 * A334184 A249545 A296081
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 11 2011
STATUS
approved

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Last modified June 15 13:08 EDT 2024. Contains 373407 sequences. (Running on oeis4.)