The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A064539 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A064539

Numbers n such that 2^n + n^2 is prime.
(history; published version)

#31 by Alois P. Heinz at Thu May 11 14:47:08 EDT 2023

STATUS

proposed

approved

#30 by Wesley Ivan Hurt at Thu May 11 13:29:35 EDT 2023

STATUS

editing

proposed

#29 by Wesley Ivan Hurt at Thu May 11 13:29:10 EDT 2023

COMMENTS

n is always an odd multiple of 3 (except for the first term), i.e. , a(n) is a subsequence of A016945. - Lekraj Beedassy, Jan 01 2007

CROSSREFS

Cf. A001580, A016945, A061119, A072180, A094133.

STATUS

proposed

editing

#28 by Michel Marcus at Thu May 11 12:49:19 EDT 2023

STATUS

editing

proposed

#27 by Michel Marcus at Thu May 11 12:49:15 EDT 2023

EXTENSIONS

More terms a(10)-a(13) from Hugo Pfoertner, Jun 26 2004

STATUS

proposed

editing

#26 by Michel Marcus at Thu May 11 12:46:45 EDT 2023

STATUS

editing

proposed

#25 by Michel Marcus at Thu May 11 12:46:41 EDT 2023

EXTENSIONS

One more term a(14) from Ryan Propper, May 11 2023. n=1933695 corresponds to a probable prime with 582101 digits, and was PRP tested with PFGW.

STATUS

proposed

editing

#24 by Alois P. Heinz at Thu May 11 12:40:54 EDT 2023

STATUS

editing

proposed

#23 by Alois P. Heinz at Thu May 11 12:40:21 EDT 2023

COMMENTS

Last three values Values 2^2007+2007^2, 2^2127+2127^2, 2^3759+3759^2 were proved prime with Primo.

STATUS

proposed

editing

#22 by Ryan Propper at Thu May 11 12:34:27 EDT 2023

STATUS

editing

proposed