26588

Appears in sequences

• Numbers k such that phi(k) + 2 | sigma(k + 2).at n=25A015781
• Numbers whose base-5 representation contains exactly three 2's and three 3's.at n=31A045277
• a(n) = n*(14*n^2 - 21*n + 13)/6.at n=23A071229
• 15-gonal (or pentadecagonal) pyramidal numbers: a(n) = n*(n+1)*(13*n-10)/6.at n=23A177890
• Number of 2 X 2 nonsingular 0..n matrices with rows and columns in increasing order.at n=15A183762
• Number of one-sided poly-[3^3.4^2]-tiles (polyhouses) (holes allowed) with n cells.at n=8A197157
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+84847)^2 = y^2.at n=18A201917
• Number of free poly-IH22-tiles (holes allowed) with n cells.at n=8A213860
• Primitive integer length of the side of an origin-centered square that contains inside its boundary a point with integer coordinates that is an integer distance from three of the four corners.at n=19A215365
• Number of (n+4)X(n+4) 0..1 matrices with each 5X5 subblock idempotent.at n=11A224682
• a(n) = 23*n^2.at n=34A244632
• Primitive values n such that the square with opposite corners (0,0) and (n,n) contains a point (x,y) with integer coordinates, with 0 < x,y < n, at an integer distance from three of the four corners.at n=36A260549
• Numbers n such that Bernoulli number B_{n} has denominator 1410.at n=30A272369
• Number of noncrossing anti-commutator friendly partitions on {1,2,...,2n}.at n=6A331836
• Triangle read by rows: T(n,k) (1 <= k <= n) = number of ways to choose three points from an n X k grid of points which are the vertices of a triangle of nonzero area.at n=34A334705