3892729

Appears in sequences

• Squares-of-primes in which no two adjacent digits have the same parity.at n=25A030146
• Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.at n=5A207420
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.at n=5A207424
• Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.at n=5A207430
• Numbers n such that 2n-1 and sigma(n) are both primes.at n=23A249902