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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 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

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