53991

Appears in sequences

• a(n) = A000203(n) * A024916(n).at n=31A143238
• Number of strings of numbers x(i=1..7) in 0..n with sum i^2*x(i)^3 equal to 49*n^3.at n=41A184322
• Numbers k such that R_k + 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=21A256722
• Number of sets of nonempty words with a total of n letters over binary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=15A293741
• Expansion of 1/(2 - Product_{k>=2} 1/(1 - x^k)).at n=20A307057