A379348 Number of positive integers of the form k^2 - 2 whose greatest prime factor is A038873(n), the n-th prime not congruent to 3 or 5 mod 8.

1, 3, 4, 6, 5, 8, 10, 10, 10, 14, 20, 22, 30, 30, 37, 42, 43, 48, 49, 64, 80

Offset: 1

Author

Andrew Howroyd, Dec 22 2024

Keywords

• nonn
• more

Comments

See A242488 for additional information.

Examples

			Table showing n, p = A038873(n) and a(n):
   1    2    1
   2    7    3
   3   17    4
   4   23    6
   5   31    5
   6   41    8
   7   47   10
   8   71   10
   9   73   10
  10   79   14
  ...
		

Links

• Filip Najman, Smooth values of some quadratic polynomials, Glasnik Matematicki Series III 45 (2010), pp. 347-355.

Crossrefs

Row lengths of A242488.

Cf. A038873, A185396, A379349.