68113

Properties

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (F(2), F(3), ...), t = A000201 (lower Wythoff sequence).at n=28A024593
• Smallest prime such that n*k(n)^2+n*k(n)+1 is a prime > (n-1)*k(n-1)^2+(n-1)*k(n-1)+1 with k(n)>1 or 0 if n=4 as no prime possible.at n=35A104995
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.at n=12A147171
• Primes of the form 9n^2 - 8.at n=16A201961
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 814", based on the 5-celled von Neumann neighborhood.at n=8A273643
• Number of nX7 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.at n=19A297888
• Primes that are values of A215240.at n=20A320041
• Prime numbersat n=6783