31423

Appears in sequences

• Composite numbers whose prime factors contain no digits other than 6 and 7.at n=9A036322
• Numbers k such that the squarefree part of k equals A062799(k).at n=38A069551
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (0, 1, -1), (1, 0, -1), (1, 1, 0)}.at n=10A148675
• a(n) = smallest composite (odd) number greater than a(n-1) such that a(n)+2n is the first prime after a(n).at n=22A189118
• G.f. satisfies: A(x) = 1 + x/A(-x*A(x)^6)^3.at n=7A213096
• Number of partitions p of n such that mean(p) >= multiplicity(min(p)).at n=43A240079
• Number of partitions p of n such that mean(p) > multiplicity(min(p)).at n=43A240206
• Numbers k such that p^2 divides k, where p = A006530(k), the largest prime factor of k, and sigma(k) does not have any prime factor larger than p.at n=32A336354
• Numbers k such that sigma(k) = psi(k) + tau(k) + omega(k).at n=17A386637