The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A065727

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

A065727

Primes p such that the decimal expansion of its base-9 conversion is also prime.
(history; published version)

#22 by Michael De Vlieger at Sat Mar 05 11:09:05 EST 2022

STATUS

reviewed

approved

#21 by Joerg Arndt at Sat Mar 05 04:01:37 EST 2022

STATUS

proposed

reviewed

#20 by Michel Marcus at Sat Mar 05 03:04:06 EST 2022

STATUS

editing

proposed

#19 by Michel Marcus at Sat Mar 05 03:04:03 EST 2022

COMMENTS

In general rebase notation (Marc LeBrun): p(n) p9 = (9) [p] (10).

STATUS

approved

editing

#18 by Harvey P. Dale at Sun Sep 19 19:41:08 EDT 2021

STATUS

editing

approved

#17 by Harvey P. Dale at Sun Sep 19 19:41:06 EDT 2021

MATHEMATICA

Select[Prime[Range[400]], PrimeQ[FromDigits[IntegerDigits[#, 9], 10]]&] (* Harvey P. Dale, Sep 19 2021 *)

STATUS

approved

editing

#16 by Vaclav Kotesovec at Tue Jul 07 01:52:16 EDT 2020

STATUS

proposed

approved

#15 by Michel Marcus at Thu Jul 02 12:40:18 EDT 2020

STATUS

editing

proposed

#14 by Michel Marcus at Thu Jul 02 12:40:12 EDT 2020

PROG

(PARI) isok(p) = isprime(p) && isprime(fromdigits(digits(p, 9))); \\ Michel Marcus, Jul 02 2020

CROSSREFS

Intersection of A000040 and A036964.

#13 by Michel Marcus at Thu Jul 02 12:37:26 EDT 2020

CROSSREFS

Cf. A065720 up to , A065721, A065722, A065723, A065724, A065725, A065726, A065361.

STATUS

proposed

editing