57399

Appears in sequences

• Numbers k such that all the following properties hold: (i) k*reverse(k) is a square; (ii) k != reverse(k); (iii) k and reverse(k) are not both squares; and (iv) k and reverse(k) have the same number of digits.at n=25A082994
• a(n) = Sum(Sum p_i, {Sum p_i=prime(n)}, p_i is prime).at n=15A120484
• Numbers k which can be split into two numbers x and y such that x^3 + y^2 is a multiple of k.at n=44A162451
• Expansion of Sum_{k>=1} prime(k)*x^prime(k)/(1 - x^prime(k)) * Product_{k>=1} 1/(1 - x^prime(k)).at n=52A276560
• Number of vertices formed inside a right triangle by the straight line segments mutually connecting all vertices and points on the two shorter edges whose positions on one edge equal the Farey series of order n while on the other they divide its length into n equal segments.at n=11A359974