A076498 -id:A076498 - cp's OEIS frontend

A076499 Partial sums of A076498.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24, 25, 26, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 78, 79, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93

Offset: 1

N. J. A. Sloane, Nov 11 2002

nonn

Herman te Riele and Hugh Williams, New computations concerning the Cohen-Lenstra heuristics, Experiment. Math. 12 (2003), no. 1, 99-113; alternative link.

Cf. A076498.

A380782 Class number of real quadratic field Q(sqrt(prime(n))).

Original entry on oeis.org

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

Offset: 1

Steven Lu, Feb 02 2025

nonn

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

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

Cf. A003172, A076498, A278837.

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

cp's OEIS Frontend

A076499 Partial sums of A076498.

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A380782 Class number of real quadratic field Q(sqrt(prime(n))).

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