The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A065404

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A065404

Squares of composite numbers k such that sigma(k) (sum of divisors of k, A000203) is a prime.
(history; published version)

#17 by OEIS Server at Sat Jul 18 04:32:46 EDT 2020

LINKS

Amiram Eldar, <a href="/A065404/b065404_1.txt">Table of n, a(n) for n = 1..500</a> (terms 1..100 from Harry J. Smith)

#16 by Joerg Arndt at Sat Jul 18 04:32:46 EDT 2020

STATUS

reviewed

approved

Discussion

Sat Jul 18

04:32

OEIS Server: Installed new b-file as b065404.txt.  Old b-file is now b065404_1.txt.

#15 by Michel Marcus at Sat Jul 18 04:05:49 EDT 2020

STATUS

proposed

reviewed

#14 by Amiram Eldar at Sat Jul 18 03:39:41 EDT 2020

STATUS

editing

proposed

#13 by Amiram Eldar at Sat Jul 18 03:25:22 EDT 2020

LINKS

Amiram Eldar, <a href="/A065404/b065404_1.txt">Table of n, a(n) for n = 1..500</a> (terms 1..100 from Harry J. Smith)

#12 by Amiram Eldar at Sat Jul 18 03:25:02 EDT 2020

LINKS

Harry J. Smith, Amiram Eldar, <a href="/A065404/b065404_1.txt">Table of n, a(n) for n = 1..100500</a>

STATUS

approved

editing

#11 by Susanna Cuyler at Mon Jun 18 09:01:13 EDT 2018

STATUS

proposed

approved

#10 by Michel Marcus at Mon Jun 18 03:55:17 EDT 2018

STATUS

editing

proposed

#9 by Michel Marcus at Mon Jun 18 03:55:12 EDT 2018

FORMULA

Sigma(A065404(n)) = Sigmasigma(a(n)) = A065403(n) = A000203(A065404(n)).

CROSSREFS

Cf. A062700, A000203, (sigma), A065403-, A065405, A053182, A053183, A028982.

STATUS

proposed

editing

#8 by Jon E. Schoenfield at Sun Jun 17 22:31:00 EDT 2018

STATUS

editing

proposed