260680

Appears in sequences

• a(n) is the least index such that the least primitive root of the a(n)-th prime is n, or zero if no such prime exists.at n=70A066529
• Least k such that the least positive primitive root of prime(k) equals prime(n).at n=19A079060
• Number of (n+1) X (8+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings).at n=8A235278
• Number of (n+1) X (9+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings).at n=7A235279
• Expansion of (x+x^3+x^5)/(1-x-3*x^3-x^5).at n=21A309331