25853

Appears in sequences

• Number of bipartite partitions.at n=18A002768
• Numbers n such that sigma(phi(n))/sigma(n) = 3.at n=8A067383
• a(n) = A006046(A077465(n)).at n=9A077466
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+343)^2 = y^2.at n=19A118611
• The largest number m such that sigma(m) = A007368(n), where A007368(n) = the smallest k such that sigma(x) = k has exactly n solutions.at n=43A184394
• Number of (n+4)X5 0..1 matrices with each 5X5 subblock idempotent.at n=10A224683
• a(n) = prime(n) * prime(2n).at n=26A319613
• Nonprime Heinz numbers of multiples of triangular partitions, or of finite arithmetic progressions with offset 0.at n=35A325407
• a(n) = Sum_{k=0..n} Stirling2(n,k)^k.at n=5A345040
• Result of inserting the integers n = 0, 1, 2, ... in this order into an initially empty list, where n is inserted between the pair of consecutive elements with sum equal to n and minimal absolute difference, or at the end of the list if no such pair exists.at n=16A360447
• Numbers k such that the abundancy index of sigma(k) divided by the abundancy index of d(k) equals a whole number.at n=19A392507