34881

Appears in sequences

• First row of spectral array W(sqrt(3)).at n=24A022159
• Odd numbers with exactly 4 distinct palindromic prime factors.at n=14A046406
• Expansion of (1+2*x+3*x^2)/((1-x)^3*(1-x^2)).at n=40A055232
• q-factorial numbers 3!_q.at n=32A069778
• Odd numbers k such that the number of 1's in binary representation of k equals omega(k), the number of distinct primes in the factorization of k.at n=36A071595
• Number of prime pairs below 10^n having a difference of 44.at n=7A093976
• The number of permutations of length n sortable by 3 prefix reversals (in the pancake sorting sense).at n=33A228398
• Maximum detour index of any bipartite graph on n nodes.at n=41A296819
• Numbers x that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) < gpf(x) are the least and the greatest prime factors of x: A020639 and A006530.at n=35A307108
• a(n) = n*((2*n + 1)*(2*n^2 + 2*n + 3) - 3*(-1)^n)/24.at n=21A325517
• a(n) = m is the least m = b*c > a(n-1) such that (b+c)*n = m-1 where 1 < b <= c < m.at n=31A364171