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

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

Offset: 1

Author

Jonathan Sondow, Sep 20 2012

Keywords

• nonn
• hard
• more

Comments

See A054377 for comments, references, and links.

Examples

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

Crossrefs

Cf. A054377, A216825, A236433.

Programs

Mathematica

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