"First factor" (or relative class number) h- for cyclotomic field Q( exp(2 Pi / prime(n)) ).

A000927

"First factor" (or relative class number) h- for cyclotomic field Q( exp(2 Pi / prime(n)) ).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =8a(10) =9a(11) =37a(12) =121a(13) =211a(14) =695a(15) =4889a(16) =41241a(17) =76301a(18) =853513a(19) =3882809a(20) =11957417a(21) =100146415a(22) =838216959a(23) =13379363737a(24) =411322824001

External references