A100497 Numbers n such that (2^n+1)^4-2 is a semiprime.

0, 2, 3, 4, 6, 8, 10, 12, 16, 19, 22, 43, 44, 45, 52, 67, 76, 117, 130, 151, 169, 208, 232, 262

Offset: 1

Author

Jonathan Vos Post, Nov 23 2004

Keywords

• nonn
• more
• hard

Comments

a(20) >= 151. - Hugo Pfoertner, Jul 24 2019

a(25) >= 361. - Tyler Busby, Feb 17 2023

Links

• Status of (2^361+1)^4-2 in factordb.com.

Crossrefs

Cf. A100496, n such that (2^n+1)^4-2 is prime.

Programs

Mathematica

Select[Range[0,130],PrimeOmega[(2^#+1)^4-2]==2&] (* Harvey P. Dale, Sep 02 2016 *)

Extensions

Corrected by Hugo Pfoertner, Nov 25 2004

a(20)-a(24) from Tyler Busby, Feb 17 2023