1742400

Appears in sequences

• Order of universal Chevalley group D_2(q), q = prime power.at n=7A003841
• a(n) = phi(Fibonacci(n)).at n=33A065449
• a(n) = (1/2) * (number of n X n 0..10 matrices with MM' mod 11 = I).at n=3A071309
• Squares such that the sum of two neighboring term is also a square.at n=17A072471
• a(n) = n^2 * (n+1)^2 * (n+2)^2 = 36*A001249(n-1).at n=10A099764
• Triangle T(n, k, m) = f(n, m)/(f(k, m)*f(n-k, m)), where T(0, k, m) = 1, f(n, k) = Product_{j=1..n} ( j!*((k+1)^j -1)/k ), f(n, 0) = n!, and m = 2, read by rows.at n=17A156766
• Triangle T(n, k, m) = f(n, m)/(f(k, m)*f(n-k, m)), where T(0, k, m) = 1, f(n, k) = Product_{j=1..n} ( j!*((k+1)^j -1)/k ), f(n, 0) = n!, and m = 2, read by rows.at n=18A156766
• Number of n X 8 binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=21A188823
• Numbers n such that round(n^(1/k)) divides n for all integers k>=1.at n=19A261341
• Number of 6-cycles in the n-transposition graph.at n=5A300851
• Numbers k such that sigma(k) - 3k is prime.at n=17A306492