64129

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 20.at n=14A031608
• Numbers n such that prime(n) contains a substring of all the prime digits in order, i.e., "2357".at n=28A295708
• a(n) = [x^(n*(n+1)/2)] Product_{k=1..n} Sum_{m>=0} x^(k*m^2).at n=14A320932