A337813 Numbers k such that the number of distinct prime factors of 2^k - 1 is greater than the corresponding count for 2^k + 1.

4, 8, 10, 12, 16, 20, 22, 24, 28, 30, 32, 36, 39, 40, 43, 44, 45, 48, 50, 52, 55, 56, 58, 60, 63, 64, 66, 68, 70, 72, 75, 76, 79, 80, 84, 87, 88, 90, 92, 94, 96, 99, 100, 102, 104, 106, 108, 110, 112, 116, 117, 119, 120, 124, 126, 128, 132, 135, 136, 140, 144

Offset: 1

Author

Hugo Pfoertner, Sep 23 2020

Keywords

• nonn

Crossrefs

Cf. A046799, A046800, A067886, A337810, A337811, A337812.

Programs

PARI

for(n=1,150,if(omega(2^n-1)>omega(2^n+1),print1(n,", ")))