24558

Appears in sequences

• E.g.f.: 1 + log(1+f(x)) where f(x) = log(1/(2-exp(x))) = e.g.f. for A000629.at n=8A075792
• Numbers k such that 5^k - 2 is prime.at n=12A109080
• Largest number which requires n iterations of the bi-unitary totient function (A116550) to reach 1.at n=24A225175
• Number of non-equivalent binary n X n matrices with two nonadjacent 1's.at n=24A232567
• Number of length n arrays of permutations of 0..n-1 with each element moved by -5 to 5 places and with no two consecutive increases or two consecutive decreases.at n=10A263663
• a(n) = 24*2^n - 18.at n=10A305163
• a(n) is the smallest number k for which A000120(k) = A000120(k') = n, or -1 if no such k exists, where k' is the arithmetic derivative of k (A003415).at n=12A350553