20647

Appears in sequences

• Number of primitive (aperiodic) palindromic structures using a maximum of six different symbols.at n=17A056480
• Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols.at n=17A056517
• Numbers k such that 2^k - 19 is prime.at n=22A096819
• a(n) = 15n^2 + 3n + 1.at n=36A165806
• Number of n X 2 0..2 arrays with rows and columns in nondecreasing order.at n=8A184130
• Denominators of the convergents to sqrt(14)/2 = A294969.at n=12A295337
• Numerator of the barycenter of first n primes defined as a(n) = numerator(Sum_{i=1..n} (i*prime(i)) / Sum_{i=1..n} prime(i)).at n=35A306834
• a(n) = a(n-1) + 4*a(n-3) + 2*a(n-4) + 2*a(n-5); a(0) = a(1) = a(2) = 1, a(3) = 5, a(4) = 11.at n=14A337492