A380782 - OEIS

A380782

Class number of real quadratic field Q(sqrt(prime(n))).

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 1, 5, 3, 1

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OFFSET

1,22

COMMENTS

A278837 contains all primes p where the class number of Q(sqrt(p)) is larger than 1.

LINKS

Table of n, a(n) for n=1..87.

EXAMPLE

For n = 22, a(22) = 3 since the class number of Q(sqrt(79)) is 3 where 79 is the 22nd prime.

MATHEMATICA

Table[NumberFieldClassNumber[Sqrt[Prime[i]]], {i, 87}]

CROSSREFS