19462

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite BEA = Beta Na7[Al7Si57O128] starting with a T2 atom.at n=13A019068
• a(n) = Sum_{i=n..n+3} Sum_{j=i+1..n+4} prime(i)*prime(j).at n=11A127350
• G.f. satisfies: A(A(A(A(x)))) = A(A(A(x))) + x^2.at n=5A177751
• Number of (n+4)X(n+4) 0..1 matrices with each 5X5 subblock idempotent.at n=10A224682
• Numbers k such that 2*R_k + 7*10^k + 5 is prime, where R_k = 11...11 is the repunit (A002275) of length k.at n=8A259135
• Number of nX7 0..1 arrays with every element equal to 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=21A298186
• Mark each point on the n X n X n X n grid with the number of points that are visible from it; a(n) is the number of distinct values in the grid.at n=55A339947
• Numbers m such that there exists at least one integer k < m where m^2 + 2 and k^2 + 2 have the same prime factors.at n=31A348889
• G.f. A(x) satisfies: A(x) = x + x^2 * exp( Sum_{k>=1} A(x^k)^4 / (k*x^(3*k)) ).at n=9A363466
• Indices k such that A377091(k) is immediately followed by A377091(k+1) = -A377091(k).at n=56A379802
• Numbers k such that Fibonacci(k) has a Fibonacci number of 1's in its binary representation.at n=59A382053