150497

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 5x + 4.at n=19A023314
• Tribonacci analog of A055502.at n=19A113823
• 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, 0, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.at n=11A148420
• Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors.at n=4A283687
• T(n,k) = Number of n X k 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors.at n=32A283691
• Number of 5Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors.at n=3A283695
• a(n) is the number of n-digit proper prime powers.at n=12A303220
• Prime numbersat n=13891