70906

Appears in sequences

• a(n) is the smallest k >= 2 such that k^(2^n)+1 is prime, or -1 if no such k exists.at n=15A056993
• Numbers n such that n | 11^n + 9^n + 7^n + 5^n + 3^n + 1.at n=36A057832
• Numbers b such that b^(2^15) + 1 is prime (a generalized Fermat prime).at n=1A226530
• Number of (n+2) X (5+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.at n=5A260606
• Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.at n=4A260607