The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A128340

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A128340

Numbers k such that (11^k + 5^k)/16 is prime.
(history; published version)

#12 by N. J. A. Sloane at Fri Jun 11 00:17:47 EDT 2021

STATUS

proposed

approved

#11 by Jon E. Schoenfield at Thu Jun 10 23:35:44 EDT 2021

STATUS

editing

proposed

#10 by Jon E. Schoenfield at Thu Jun 10 23:35:43 EDT 2021

NAME

Numbers n k such that (11^n k + 5^nk)/16 is prime.

CROSSREFS

Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128341, A128342, A128343. Cf. A004061, A082182, A121877, A059802. Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.

Cf. A004061, A082182, A121877, A059802.

Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.

STATUS

approved

editing

#9 by Charles R Greathouse IV at Fri Feb 17 11:58:48 EST 2017

STATUS

editing

approved

#8 by Charles R Greathouse IV at Fri Feb 17 11:58:44 EST 2017

PROG

(PARI) is(n)=isprime((11^n+5^n)/16) \\ Charles R Greathouse IV, Feb 17 2017

STATUS

approved

editing

#7 by T. D. Noe at Sat Feb 09 12:18:53 EST 2013

STATUS

editing

approved

#6 by T. D. Noe at Sat Feb 09 12:18:49 EST 2013

COMMENTS

a(11) > 10^5 . - _Robert Price, _, Feb 09 2013

STATUS

proposed

editing

#5 by Robert Price at Sat Feb 09 09:25:56 EST 2013

STATUS

editing

proposed

Discussion

Sat Feb 09

12:20

Wouter Meeussen: It would be nice to know how you determined primality for the 30234-digit integer.

#4 by Robert Price at Sat Feb 09 09:25:20 EST 2013

DATA

7, 11, 181, 421, 2297, 2797, 4129, 4139, 7151, 29033

COMMENTS

a(11) > 10^5 - Robert Price, Feb 09 2013

EXTENSIONS

a(5)-a(10) from Robert Price, Feb 09 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