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

1,1

Links

Table of n, a(n) for n=1..58.

Example

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.

Sequence in context: A037371 A236300 A046790 * A171425 A143720 A231016

Adjacent sequences: A057108 A057109 A057110 * A057112 A057113 A057114

Keyword

easy,nonn

Author

Henry Bottomley, Aug 08 2000

Extensions

More terms from James A. Sellers, Aug 22 2000

Status

approved