31539

Appears in sequences

• Number of partitions of n into parts having at most two prime-factors.at n=41A101049
• Expansion of g.f. (1-x-2*x^2-x^3+x^4)/((x-1)^3*(6*x^2+2*x-1)).at n=8A107307
• Number of permutations of length n which avoid the patterns 1234, 3421, 4231.at n=12A116803
• Odd numbers which are factored to the same set of primes in Z as to the irreducible polynomials in GF(2)[X]; odd terms of A235036.at n=33A235039
• Number of multisets of nonempty words with a total of n letters over 5-ary alphabet such that within each word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=8A292720
• a(n) is the least k such that A366912(k) = n.at n=18A366913