26846

Appears in sequences

• Numbers k such that sigma(sigma(k) - k) = phi(sigma(k) + k).at n=19A074886
• Let P(A) be the power set of an n-element set A. Then a(n) = the number of pairs of elements {x,y} of P(A) for which either 0) x and y are disjoint and for which either x is a subset of y or y is a subset of x, or 1) x and y are disjoint and for which x is not a subset of y and y is not a subset of x, or 2) x and y are intersecting but for which x is not a subset of y and y is not a subset of x, or 3) x = y.at n=8A134165
• a(n) = 8^n mod 7^n.at n=6A138973
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.at n=8A150276
• Number of right triangles on an (n+1) X 5 grid.at n=31A189809
• Maximum fixed points under iteration of sum of cubes of digits in base n.at n=27A226026
• Number of integer partitions whose sum of primes of parts equals their sum of parts plus n.at n=41A331387
• Total surface area of all rectangular prisms with dimensions p X q X q, where p and q are prime, n = p+q and p<q.at n=53A335188