A272601 Composites n such that p-1 does not divide n-1 for at least one prime divisor of n-1.

4, 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 50, 51, 52, 54, 56, 57, 58, 60, 62, 63, 64, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110, 111, 112, 114, 115, 116

Offset: 1

Author

Joerg Arndt, May 16 2016

Keywords

• nonn

Comments

Composites not in A272600.

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Programs

PARI

forcomposite(n=4, 10^3, my(q=1, f=factor(n-1)[,1]); for(j=1, #f, if((n-1)%(f[j]-1), q=0; break)); if(!q, print1(n,", ")));