The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A128348 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A128348

Numbers k such that (12^k - 5^k)/7 is prime.
(history; published version)

#21 by Joerg Arndt at Fri Jun 11 04:58:31 EDT 2021

STATUS

reviewed

approved

#20 by Michel Marcus at Fri Jun 11 04:33:37 EDT 2021

STATUS

proposed

reviewed

#19 by Jon E. Schoenfield at Thu Jun 10 23:33:39 EDT 2021

STATUS

editing

proposed

#18 by Jon E. Schoenfield at Thu Jun 10 23:33:38 EDT 2021

NAME

Numbers n k such that (12^n k - 5^nk)/7 is prime.

CROSSREFS

Cf. A062572, A128344, A128345, A128346, A128347, A128349, A128350, A128351, A128352, A128353, A128354. Cf. A004061, A082182, A121877, A059802. Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128340, A128341, A128342.

Cf. A004061, A082182, A121877, A059802.

Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128340, A128341, A128342.

STATUS

approved

editing

#17 by Charles R Greathouse IV at Fri Feb 17 11:57:01 EST 2017

STATUS

editing

approved

#16 by Charles R Greathouse IV at Fri Feb 17 11:56:59 EST 2017

COMMENTS

Primality of the primes formed by a(8) and a(9) were certified by Primo. [_- _Ray G. Opao_, Jul 01 2012]

PROG

(PARI) is(n)=isprime((12^n-5^n)/7) \\ Charles R Greathouse IV, Feb 17 2017

STATUS

approved

editing

#15 by Bruno Berselli at Tue Sep 23 09:13:46 EDT 2014

STATUS

proposed

approved

#14 by Ray G. Opao at Tue Sep 23 08:14:13 EDT 2014

STATUS

editing

proposed

#13 by Ray G. Opao at Tue Sep 23 08:13:43 EDT 2014

COMMENTS

Primality of the primes formed by a(8) and a(9) were certified by Primo. a(10) > 10^5. [Ray G. Opao, Jul 01 2012]

STATUS

approved

editing

#12 by Joerg Arndt at Sun Mar 03 01:58:09 EST 2013

STATUS

editing

approved