A216826 - OEIS

A216826

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

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

See A054377 for comments, references, and links.

LINKS

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

KEYWORD

nonn,hard,more

AUTHOR

STATUS

approved