The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A055638 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A055638

Numbers n for which sigma(n^2) is prime.
(history; published version)

#49 by Charles R Greathouse IV at Thu Sep 08 08:45:01 EDT 2022

PROG

(MAGMAMagma) [n: n in [1..2000] | IsPrime(SumOfDivisors(n^2))]; // Vincenzo Librandi, Oct 18 2014

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#48 by Jon E. Schoenfield at Sat Mar 02 23:09:56 EST 2019

STATUS

proposed

approved

#47 by Jon E. Schoenfield at Sat Mar 02 20:01:39 EST 2019

STATUS

editing

proposed

#46 by Jon E. Schoenfield at Sat Mar 02 20:01:37 EST 2019

LINKS

T. D. Noe and Robert G. Wilson v, <a href="/A055638/b055638.txt">Table of n, a(n) for n = 1..10000</a> (first 4730 terms from T. D. Noe.)

STATUS

approved

editing

#45 by Bruno Berselli at Mon Nov 20 05:41:04 EST 2017

STATUS

reviewed

approved

#44 by Michael B. Porter at Sun Nov 19 23:03:54 EST 2017

STATUS

proposed

reviewed

#43 by Michel Marcus at Sat Nov 18 02:34:58 EST 2017

STATUS

editing

proposed

#42 by Michel Marcus at Sat Nov 18 02:34:54 EST 2017

FORMULA

A055638 = Equal to A000961 \ A248963. - M. F. Hasler, Oct 19 2014

STATUS

proposed

editing

#41 by Thomas Ordowski at Sat Nov 18 02:24:51 EST 2017

STATUS

editing

proposed

#40 by Thomas Ordowski at Sat Nov 18 02:21:42 EST 2017

COMMENTS

Primes in the sequence are A053182. - Thomas Ordowski, Nov 18 2017

STATUS

approved

editing