30704

Appears in sequences

• Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having two, four or six distinct values for every i,j,k<=n.at n=6A211729
• Numbers n such that the n-th prime equals the n-th Ramanujan prime of the totient of n.at n=9A267012
• Numbers which are representable as a sum of nineteen but no fewer consecutive nonnegative integers.at n=35A270303
• Prime power Giuga numbers: composite numbers n > 1 such that -1/n + sum 1/p^k = 1, where the sum is over the prime powers p^k dividing n.at n=11A286497
• Numbers k such that 315*2^k+1 is prime.at n=47A322949