45421

Appears in sequences

• Numbers n>1 with the property that the decimal expansion of n is a permutation of the digits of the decimal expansion of phi(n) and the ratio n/phi(n) is a new record low value.at n=6A102018
• Numbers k such that 7*10^k + 4*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=17A103057
• 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), (0, 0, -1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.at n=9A149577
• Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.at n=5A220734
• T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.at n=41A220738
• Number of ways to reciprocally link elements of an 6 X n array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.at n=3A220743
• Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 10.at n=14A244711
• Numbers k such that (5*10^k + 37)/3 is prime.at n=24A281171