853513

Appears in sequences

• "First factor" (or relative class number) h- for cyclotomic field Q( exp(2 Pi / prime(n)) ).at n=18A000927
• Class number h = h- * h+ of cyclotomic field Q( exp(2 Pi / prime(n)) ).at n=18A055513
• 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=49A061494
• Relative class number h- of cyclotomic field Q(zeta_n).at n=66A061653