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A178835 Primes of the form 19 * 2^n - 1. 1
37, 151, 607, 39845887, 41781441855487, 10696049115004927, 11760430373211112611541680127, 206891679087930585785731761318515072565247, 52964269846510229961147330897539858576703487, 888592995497188974267840378291500075950806986129407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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

MATHEMATICA

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

PROG

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

CROSSREFS

Sequence in context: A096700 A158596 A142688 * A250942 A250943 A142197

Adjacent sequences:  A178832 A178833 A178834 * A178836 A178837 A178838

KEYWORD

nonn

AUTHOR

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

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

STATUS

approved

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Last modified September 24 22:31 EDT 2017. Contains 292441 sequences.