A178835 Primes of the form 19 * 2^n - 1.

37, 151, 607, 39845887, 41781441855487, 10696049115004927, 11760430373211112611541680127, 206891679087930585785731761318515072565247, 52964269846510229961147330897539858576703487, 888592995497188974267840378291500075950806986129407

Offset: 1

Author

Kevin Batista (kevin762401(AT)yahoo.com), Jun 16 2010

Keywords

• nonn

Comments

Main entry for this sequence is A001775.

Also primes of the form 38 * 4^n - 1, since even-numbered exponents yield numbers divisible by three.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..20

Programs

Magma

[a: n in [0..250] | IsPrime(a) where a is (19 * 2^n - 1)]; // Vincenzo Librandi, Mar 08 2014

Mathematica

Select[19*2^Range[140]-1,PrimeQ] (* Harvey P. Dale, Mar 07 2014 *)

Extensions

Edited by Charles R Greathouse IV, Aug 29 2010

Edited by Charles R Greathouse IV, Sep 02 2010

More terms from Harvey P. Dale, Mar 07 2014