20429

Appears in sequences

• Multiplicity of highest weight (or singular) vectors associated with character chi_138 of Monster module.at n=42A034526
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 22.at n=48A051963
• Total number of parts greater than 1 in all partitions of n minus the number of partitions of n into parts each less than n.at n=29A198381
• Triangle defined by g.f.: A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n, k)^n * y^k ), as read by rows.at n=17A209424
• Triangle defined by g.f.: A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n, k)^n * y^k ), as read by rows.at n=18A209424
• Column 2 of triangle A209424.at n=3A209425
• Conjectured record-breaking numbers of odd elements, for ascending positive integers k, in primitive cycles of positive integers under iteration by the Collatz-like 3x+k function.at n=30A226673
• Least number k such that (n!+k)/n and (n!-k)/n are both prime.at n=28A245697
• G.f.: Product_{k>=1, j>=1} (1+x^(j*k^2)).at n=50A280451
• a(n) is the number of prime powers k such that ceiling(log_2(k)) = n.at n=18A304521