A057111 Numbers n which are a factor of (LPP(n)-1)!, where LPP(n) is the largest prime power factor of n.

8, 9, 16, 18, 24, 25, 27, 32, 36, 40, 45, 48, 49, 50, 54, 56, 63, 64, 72, 75, 80, 81, 90, 96, 98, 100, 108, 112, 120, 121, 125, 126, 128, 135, 144, 147, 150, 160, 162, 168, 169, 175, 176, 180, 189, 192, 196, 200, 208, 216, 224, 225, 240, 242, 243, 245, 250, 252

Offset: 1

Author

Henry Bottomley, Aug 08 2000

Keywords

• easy
• nonn

Examples

			18 is in the sequence since 9 is the largest prime power factor of 18 and 18 is a factor of (9-1)!=8!=40320=18*2240.
		

Crossrefs

Cf. A002034, A034699, A057109, A057110. Distinct from A046790 although similar initial terms.

Extensions

More terms from James Sellers, Aug 22 2000