The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A128347 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A128347

Numbers k such that (11^k - 5^k)/6 is prime.
(history; published version)

#11 by Jon E. Schoenfield at Thu Nov 01 21:27:49 EDT 2018

STATUS

editing

approved

#10 by Jon E. Schoenfield at Thu Nov 01 21:27:47 EDT 2018

NAME

Numbers n k such that (11^n k - 5^nk)/6 is prime.

COMMENTS

a(10) > 10^5. - _Robert Price, _, Jan 24 2013

STATUS

approved

editing

#9 by Charles R Greathouse IV at Fri Feb 17 11:55:54 EST 2017

STATUS

editing

approved

#8 by Charles R Greathouse IV at Fri Feb 17 11:55:50 EST 2017

PROG

(PARI) is(n)=isprime((11^n-5^n)/6) \\ Charles R Greathouse IV, Feb 17 2017

STATUS

approved

editing

#7 by T. D. Noe at Thu Jan 24 15:13:48 EST 2013

STATUS

editing

approved

#6 by T. D. Noe at Thu Jan 24 15:13:44 EST 2013

COMMENTS

a(10) > 10^5 . - Robert Price. , Jan 24 2013

STATUS

proposed

editing

#5 by Robert Price at Thu Jan 24 14:56:28 EST 2013

STATUS

editing

proposed

#4 by Robert Price at Thu Jan 24 14:55:44 EST 2013

DATA

5, 41, 149, 229, 263, 739, 3457, 20269, 98221

COMMENTS

a(10) > 10^5 - Robert Price. Jan 24 2013

EXTENSIONS

a(7)-a(9) from Robert Price, Jan 24 2013

STATUS

approved

editing

#3 by Russ Cox at Sat Mar 31 13:20:35 EDT 2012

AUTHOR

_Alexander Adamchuk (alex(AT)kolmogorov.com), _, Feb 27 2007

Discussion

Sat Mar 31

13:20

OEIS Server: https://oeis.org/edit/global/879

#2 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007

COMMENTS

All terms are primeprimes.

KEYWORD

hard,more,nonn,new