30042

Appears in sequences

• Numbers n such that 5*10^n + 8*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=9A103023
• Constant term of the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=18A193044
• Generating primitive Pythagorean triangles by using (n, n+1) gives perimeters for each n. This sequence lists the sum of these perimeters for each n triangles.at n=26A193068
• Irregular triangular array T(n,k) of consecutive composites.at n=39A226085
• a(n) = 36*n^2 - 8*n - 2 (n >=1).at n=28A304834
• Sums of three primorials > 1.at n=37A370137