A216824 Largest prime factor of the n-th Giuga number A007850(n).

5, 13, 41, 59, 47057, 4447, 775807, 713863, 29133437, 3892535183, 110725121051, 1456230512169437

Offset: 1

Author

Jonathan Sondow, Sep 17 2012

Keywords

• nonn
• hard
• more

Comments

See A007850 for comments, references, and links.

Examples

			A007850(1) = 30 = 2*3*5 is the first Giuga number, so a(1) = 5.
		

Crossrefs

Cf. A007850, A216823, A236434.