41120

Appears in sequences

• a(n) = n*(2*n^2 - 3*n + 4)/3.at n=40A037235
• Numbers whose base-4 representation contains exactly four 0's and four 2's.at n=25A045061
• a(n) = Xpower(n,5).at n=10A048734
• Solutions to phi(gpf(x)) - gpf(phi(x)) = 254 = c are special multiples of 257, x = 257k, where largest prime factors of factor k were observed from {2, 3, 5, 17}. See solutions to other even cases of c (=A070813): A007283 for 0, A070004 for 2, A070814 for 14, A070816 for 65534.at n=30A070815
• Numbers k such that phi(k) is a perfect 7th power.at n=17A078167
• Number of (n+4) X 9 0..2 matrices with each 5 X 5 subblock idempotent.at n=6A224622
• Number of (n+4) X 11 0..2 matrices with each 5 X 5 subblock idempotent.at n=4A224624
• Numbers k such that Bernoulli number B_{k} has denominator 230010.at n=14A295593