A216826 Largest prime factor of the n-th primary pseudoperfect number A054377(n).

2, 3, 7, 43, 31, 47059, 3109, 1729101023519

Offset

1,1

Comments

See A054377 for comments, references, and links.

Links

Table of n, a(n) for n=1..8.

Example

42 = 2*3*7 is the third primary pseudoperfect number, so a(3) = 7.

Mathematica

A054377 = Cases[Import["https://oeis.org/A054377/b054377.txt", "Table"], {_, _}][[All, 2]];
Max /@ FactorInteger[A054377] (* Robert Price, Mar 14 2020 *)

Crossrefs

Cf. A054377, A216825, A236433.

Sequence in context: A126263 A323605 A354376 * A030087 A106864 A282027

Adjacent sequences: A216823 A216824 A216825 * A216827 A216828 A216829

Keyword

nonn,hard,more

Author

Jonathan Sondow, Sep 20 2012

Status

approved