35306

Appears in sequences

• Numbers k such that sigma(phi(k)) = sigma(k) where sigma is the sum of divisors function A000203 and phi is the Euler totient function A000010.at n=10A033631
• Numbers k such that 297*2^k-1 is prime.at n=47A050907
• G.f. x*(x^2+1)*(x^3-x-1)/((2*x^3+x^2-1)*(x^4+1)).at n=27A107854
• Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 2 ones in any row or column.at n=10A162110
• Numbers n such that sigma(sigma(phi(n))) = sigma(sigma(n)).at n=36A172466
• Number of rhombi on an n X n grid (or geoboard).at n=19A189418
• Number of length 1+3 0..n arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth.at n=12A249291
• Concatenation of sum n+(n+1) and product n*(n+1) in decimal.at n=17A337148
• Number of nonempty sets of distinct positive integers whose sum of cubes is a cube, the largest integer of a set is n.at n=27A339615