84614

Appears in sequences

• Numbers k such that k*10^10-1, k*10^10-3, k*10^10-7 and k*10^10-9 are all prime.at n=2A064981
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with no element 1 greater than its west neighbor modulo n and the upper left element equal to 0.at n=38A266309
• Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west neighbor modulo 3 and the upper left element equal to 0.at n=6A266310
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to or 1 greater than any west neighbor modulo n and the upper left element equal to 0.at n=38A267629
• Define k by A280864(k) = 2^n; then a(n) = A280864(k-1)/2, or -1 if that is not an integer.at n=15A282024