The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A359063 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A359063

Integers k such that A005420(k) = A005420(2*k) = A005420(4*k) where A005420(k) is the largest prime factor of 2^k-1.
(history; published version)

#17 by Michael De Vlieger at Fri Dec 16 17:58:37 EST 2022

STATUS

proposed

approved

#16 by Michel Marcus at Fri Dec 16 17:26:37 EST 2022

STATUS

editing

proposed

#15 by Michel Marcus at Fri Dec 16 17:26:33 EST 2022

COMMENTS

Inspired by former comment from Thomas Ordowski in A005420.

STATUS

approved

editing

#14 by N. J. A. Sloane at Thu Dec 15 13:36:12 EST 2022

STATUS

reviewed

approved

#13 by Michel Marcus at Thu Dec 15 10:16:38 EST 2022

STATUS

proposed

reviewed

#12 by Amiram Eldar at Thu Dec 15 09:33:23 EST 2022

STATUS

editing

proposed

Discussion

Thu Dec 15

09:50

Michel Marcus: you can go above 1206/4 ?

09:55

Amiram Eldar: Yes, because I need here multiples of 4 above 1206.

10:07

Michel Marcus: yes indeed , my bad

#11 by Amiram Eldar at Thu Dec 15 09:33:06 EST 2022

LINKS

Amiram Eldar, <a href="/A359063/b359063.txt">Table of n, a(n) for n = 1..68</a>

#10 by Amiram Eldar at Thu Dec 15 09:32:51 EST 2022

DATA

7, 13, 17, 31, 37, 59, 61, 65, 77, 83, 89, 97, 107, 127, 129, 131, 133, 145, 153, 165, 169, 179, 195, 197, 201, 221, 227, 235, 245, 249, 261, 269, 281, 293, 297, 303, 321, 325, 345, 369, 373, 381, 393, 399, 405, 409, 417, 421, 425, 427, 442, 443, 447, 455, 465

KEYWORD

nonn,hard,more,new

EXTENSIONS

a(36)-a(55) from Amiram Eldar, Dec 15 2022

STATUS

approved

editing

#9 by Amiram Eldar at Thu Dec 15 09:32:33 EST 2022

STATUS

reviewed

approved

#8 by Hugo Pfoertner at Thu Dec 15 09:08:39 EST 2022

STATUS

proposed

reviewed