47974

Appears in sequences

• Numbers n such that 257*2^n-1 is prime.at n=26A050887
• Palindromes which are sums of two consecutive primes.at n=31A162571
• Number of nX4 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.at n=4A241075
• Number of nX5 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.at n=3A241076
• T(n,k)=Number of nXk 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.at n=31A241078
• T(n,k)=Number of nXk 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.at n=32A241078
• a(n) = a(n-1) + a(n-2) - n*a(floor(n/2)), where a(0) = 1, a(1) = 2, a(2) = 3.at n=19A298401