22844

Appears in sequences

• Numbers n such that 1n1, 3n3, 7n7 and 9n9 are all primes.at n=32A059677
• a(n) is the least k such that the generalized Fermat number (k+1)^(2^n) + k^(2^n) is prime.at n=16A080208
• Triangle read by rows: T(n,k) is the number of binary sequences of length n containing k subsequences 0011 (n,k>=0).at n=47A118884
• Triangle read by rows: T(n,k) is the number of binary sequences of length n containing k subsequences 0110 (n,k >= 0).at n=54A118890
• Number of compositions of n such that the number of parts and the smallest part are not coprime.at n=24A199889
• Number of nX3 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2.at n=6A275261
• T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2.at n=42A275266
• Number of 7Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2.at n=2A275271