19217

Appears in sequences

• Numbers k such that 3^k - 2 is prime.at n=25A014224
• a(1) = 11, a(n) = least k such that concatenation of n copies of k with all previous concatenation gives a prime.at n=45A111477
• Semiprimes (p+4) associated with first prime in A137625.at n=7A137627
• 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, -1), (-1, -1, 0), (-1, 0, 0), (1, -1, 1), (1, 1, 0)}.at n=9A149129
• Number of (n+1) X 4 0..2 arrays with all 2 X 2 subblock sums the same.at n=6A183997
• Number of (n+1) X 8 0..2 arrays with all 2 X 2 subblock sums the same.at n=2A184001
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with all 2X2 subblock sums the same.at n=38A184003