41241

Appears in sequences

• "First factor" (or relative class number) h- for cyclotomic field Q( exp(2 Pi / prime(n)) ).at n=16A000927
• Relative class number h- of cyclotomic field Q(zeta_m) where m is n-th term of A035113.at n=72A035115
• Class number h = h- * h+ of cyclotomic field Q( exp(2 Pi / prime(n)) ).at n=16A055513
• 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=43A061494
• Relative class number h- of cyclotomic field Q(zeta_n).at n=58A061653
• Number of 8-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=22A186984
• a(n) is the first k such that A277515(k) is the n-th prime.at n=20A278107
• Expansion of Sum_{k>=0} (k * x)^k/(1 - k^3 * x).at n=5A349883