The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A128069

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A128069

Numbers k such that (3^k + 10^k)/13 is prime.
(history; published version)

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

STATUS

editing

approved

#10 by Jon E. Schoenfield at Thu Nov 01 21:24:03 EDT 2018

NAME

Numbers n k such that (3^n k + 10^nk)/13 is prime.

COMMENTS

Next term is bigger greater than 6700. - Stefan Steinerberger, May 11 2007

a(11) > 10^5 . - _Robert Price, _, Jan 15 2013

STATUS

approved

editing

#9 by Charles R Greathouse IV at Fri Feb 17 15:19:39 EST 2017

STATUS

editing

approved

#8 by Charles R Greathouse IV at Fri Feb 17 15:19:30 EST 2017

PROG

(PARI) is(n)=isprime((3^n+10^n)/13) \\ Charles R Greathouse IV, Feb 17 2017

STATUS

approved

editing

#7 by Charles R Greathouse IV at Tue Jan 15 11:29:04 EST 2013

STATUS

proposed

approved

#6 by Robert Price at Tue Jan 15 11:17:08 EST 2013

STATUS

editing

proposed

#5 by Robert Price at Tue Jan 15 11:16:07 EST 2013

DATA

3, 19, 31, 101, 139, 167, 1097, 43151, 60703, 90499

COMMENTS

a(11) > 10^5 - Robert Price, Jan 15 2013

EXTENSIONS

a(8)-a(10) from Robert Price, Jan 15 2013

STATUS

approved

editing

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

AUTHOR

_Alexander Adamchuk (alex(AT)kolmogorov.com), _, Feb 14 2007

EXTENSIONS

a(7) from _Alexander Adamchuk (alex(AT)kolmogorov.com), _, Feb 14 2007

Discussion

Sat Mar 31

13:20

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

#3 by Russ Cox at Fri Mar 30 18:49:45 EDT 2012

COMMENTS

Next term is bigger than 6700. - _Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), _, May 11 2007

Discussion

Fri Mar 30

18:49

OEIS Server: https://oeis.org/edit/global/238

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

COMMENTS

All terms are primeprimes.

Next term is bigger than 6700. - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 11 2007

CROSSREFS

Cf. A007658 = Numbers numbers n such that (3^n + 1)/4 is prime. Cf. A057469 = Numbers numbers n such that (3^n + 2^n)/5 is prime. Cf. A122853 = Numbers numbers n such that (3^n + 5^n)/8 is prime. Cf. A128066, A128067, A128068, A128070, A128071, A128072, A128073, A128074, A128075. Cf. A059801 = Numbers numbers n such that 4^n - 3^n is prime. Cf. A121977 A121877 = Numbers numbers n such that (5^n - 3^n)/2 is a prime. Cf. A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031, A128032.

KEYWORD

hard,more,nonn,new