29340

Appears in sequences

• Numbers k such that phi(k) = bigomega(k)*tau(k)^2.at n=34A068540
• Number of 4-step S, E, and NW-moving king's tours on an n X n board summed over all starting positions.at n=38A187509
• Numbers k such that 23^(k+19) + 19^(k+17) + 17^(k+13) + 13^(k+11) + 11^(k+7) + 7^(k+5) + 5^(k+3) + 3^(k+2) - 1 is prime.at n=4A308413
• Numbers k such that 8k+1, 12k+1 and 24k+1 are primes and the last two are also of the form x^2 + 27y^2, so the tetrahedral number T(24k+1) is a Fermat pseudoprime to base 2.at n=20A321867
• a(n) is the permanent of the n X n matrix M(n) whose generic entry M(i, j, n) is F(2*n - (i + j)) with 1 <= i,j <= n and F = A000045.at n=5A390884