The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A350442 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A350442

Numbers m such that 8^m reversed is prime.
(history; published version)

#19 by Michael De Vlieger at Mon Jan 31 06:48:34 EST 2022

STATUS

reviewed

approved

#18 by Michel Marcus at Mon Jan 31 03:03:01 EST 2022

STATUS

proposed

reviewed

#17 by Bernard Schott at Sun Jan 30 10:27:17 EST 2022

STATUS

editing

proposed

#16 by Bernard Schott at Sun Jan 30 09:45:25 EST 2022

COMMENTS

If k is an even term, then t = 3*k/2 is a term of A350441, because 8^k = 4^(3k/2). First examples: k = 8, 50, 552, 668, 4230, 34310, ... and corresponding t = 12, 75, 828, 1002, 6345, 51465, ... (End)

#15 by Bernard Schott at Sun Jan 30 09:41:34 EST 2022

COMMENTS

From Bernard Schott, Jan 30 2022: (Start)

If k is a term, then u = 3*k is a term of A057708, because 8^k = 2^(3k).

If k is an even term, then t = 3*k/2 is a term of A350441, because 8^k = 4^(3k/2).

STATUS

approved

editing

#14 by Alois P. Heinz at Fri Jan 28 21:18:21 EST 2022

STATUS

reviewed

approved

#13 by Michel Marcus at Tue Jan 04 12:16:41 EST 2022

STATUS

proposed

reviewed

#12 by Mohammed Yaseen at Sun Jan 02 05:03:15 EST 2022

STATUS

editing

proposed

#11 by Mohammed Yaseen at Sun Jan 02 05:02:30 EST 2022

CROSSREFS

Cf. A059003, A071586.

STATUS

proposed

editing

#10 by Mohammed Yaseen at Sun Jan 02 04:03:29 EST 2022

STATUS

editing

proposed

Discussion

Sun Jan 02

04:39

Michel Marcus: I would add A059003 to xref