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Revision History for A128344 (Underlined text is an addition; strikethrough text is a deletion.)

Showing entries 1-10 | older changes
A128344 Numbers k such that (7^k - 5^k)/2 is prime.
(history; published version)
#14 by Alois P. Heinz at Sat Jul 29 21:48:16 EDT 2023
STATUS

proposed

approved

#13 by Jon Grantham at Sat Jul 29 21:43:45 EDT 2023
STATUS

editing

proposed

#12 by Jon Grantham at Sat Jul 29 21:43:30 EDT 2023
DATA

3, 5, 7, 113, 397, 577, 7573, 14561, 58543, 100019, 123407, 136559, 208283, 210761, 457871, 608347, 636043

COMMENTS

No other terms less than 10^6. - Jon Grantham, Jul 29 2023

LINKS

Jon Grantham and Andrew Granville, <a href="https://arxiv.org/abs/2307.07894">Fibonacci primes, primes of the form 2^n-k and beyond</a>, arXiv:2307.07894 [math.NT], 2023.

EXTENSIONS

a(10)-a(17) from Jon Grantham, Jul 29 2023

STATUS

approved

editing

#11 by Jon E. Schoenfield at Thu Nov 01 21:27:24 EDT 2018
STATUS

editing

approved

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

Numbers nk such that (7^nk - 5^nk)/2 is prime.

COMMENTS

No other terms less than 10^5. - . - _Robert Price, _, May 28 2012.

STATUS

approved

editing

#9 by Charles R Greathouse IV at Fri Feb 17 11:57:20 EST 2017
STATUS

editing

approved

#8 by Charles R Greathouse IV at Fri Feb 17 11:56:54 EST 2017
PROG

(PARI) is(n)=isprime((7^n-5^n)/2) \\ Charles R Greathouse IV, Feb 17 2017

STATUS

approved

editing

#7 by Joerg Arndt at Tue May 29 05:34:09 EDT 2012
STATUS

editing

approved

#6 by Joerg Arndt at Tue May 29 05:34:02 EDT 2012
COMMENTS

No other terms less than 10000010^5. - Robert Price, May 28 2012.

STATUS

proposed

editing

#5 by Robert Price at Mon May 28 22:38:45 EDT 2012
STATUS

editing

proposed

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Last modified August 30 07:08 EDT 2024. Contains 375531 sequences. (Running on oeis4.)