11957417

Appears in sequences

• "First factor" (or relative class number) h- for cyclotomic field Q( exp(2 Pi / prime(n)) ).at n=20A000927
• Class number h = h- * h+ of cyclotomic field Q( exp(2 Pi / prime(n)) ).at n=20A055513
• Relative class number h- of cyclotomic field Q(zeta_n) where n runs through positive integers not congruent to 2 (mod 4) [A042965, but omitting the initial 0].at n=54A061494
• Relative class number h- of cyclotomic field Q(zeta_n).at n=72A061653