A379349 Number of integers of the form k^2 + 2 whose greatest prime factor is A033203(n), the n-th prime not congruent to 5 or 7 mod 8.

1, 5, 5, 7, 11, 12, 18, 18, 21, 25, 30, 47, 39, 45, 62, 63, 83, 81, 107, 105, 130

Offset

1,2

Comments

See A379350 for additional information.

Links

Table of n, a(n) for n=1..21.

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

Example

Table showing n, p = A033203(n) and a(n):
   1    2    1
   2    3    5
   3   11    5
   4   17    7
   5   19   11
   6   41   12
   7   43   18
   8   59   18
   9   67   21
  10   73   25
  ...

Crossrefs

Row lengths of A379350.

Cf. A033203, A181471, A379346, A379348.

Sequence in context: A196351 A154583 A300916 * A134125 A097996 A033300

Adjacent sequences: A379346 A379347 A379348 * A379350 A379351 A379352

Keyword

nonn,more

Author

Andrew Howroyd, Dec 22 2024

Status

approved