40584

Appears in sequences

• Numbers n such that 3*10^n + 2*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=14A102966
• Number of monic irreducible polynomials over GF(4) of degree <= n.at n=8A114946
• Smallest number k such that k^n is the sum of numbers in a twin prime pair.at n=47A195336
• Numbers that can be written using its own digits in order and by using addition and factorial operators.at n=23A195670
• Triangle read by rows: number of k-ary n-tuples (a_1,..,a_n) such that the string a_1...a_n is preprime.at n=39A215474
• Number of tilings of an n X 1 rectangle by tiles of dimension 1 X 1 and 2 X 1 such that every tile is next to a tile of different size.at n=36A245596
• T(n,k) is (1/n) times the n-th derivative of the difference between the k-th tetration of x (power tower of order k) and its predecessor at x=1; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=38A295027