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Revision History for A229268

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A229268

Primes of the form sigma(n) - tau(n), where sigma(n) = A000203(n) and tau(n) = A000005(n).
(history; published version)

#21 by Michael De Vlieger at Tue Dec 06 07:56:59 EST 2022

STATUS

reviewed

approved

#20 by Joerg Arndt at Tue Dec 06 01:26:49 EST 2022

STATUS

proposed

reviewed

#19 by Amiram Eldar at Tue Dec 06 01:24:15 EST 2022

STATUS

editing

proposed

#18 by Amiram Eldar at Tue Dec 06 01:02:13 EST 2022

MATHEMATICA

Join[{2}, Select[(DivisorSigma[1, #] - DivisorSigma[0, #]) & /@ (2*Range[20000]^2), PrimeQ]] (* Amiram Eldar, Dec 06 2022 *)

#17 by Amiram Eldar at Tue Dec 06 00:58:12 EST 2022

	FORMULA	`a(n) = A065608(A065061(n)). - Amiram Eldar, Dec 06 2022`
	CROSSREFS	`Cf. A000005, A000010, A000203, A009087, A023194, A038344, A055813, A062700, A064205, A065608, A141242, A229264, A229266`

#16 by Amiram Eldar at Tue Dec 06 00:57:44 EST 2022

LINKS

Amiram Eldar, <a href="/A229268/b229268.txt">Table of n, a(n) for n = 1..5000</a>

STATUS

approved

editing

#15 by Joerg Arndt at Sat Sep 21 12:09:42 EDT 2013

STATUS

proposed

approved

#14 by Michel Marcus at Sat Sep 21 04:15:00 EDT 2013

STATUS

editing

proposed

#13 by Michel Marcus at Sat Sep 21 04:14:38 EDT 2013

	DATA	`2, 11, 353, 1013, 2333, 16369, 58579, 65519, 123733, 1982273, 7089683, 5778653, 12795053, 10500593, 22586027, 19980143, 24126653, 67108837, 72494713, 90781993, 106199593, 203275951, 164118923, 183105421, 320210549, 259997173, 794091653, 1279963973`
	FORMULA	`a(n) = A000203(A065061(n)) - A000005(A065061(n)). - Michel Marcus, Sep 21 2013`
	EXTENSIONS	`More terms from Michel Marcus, Sep 21 2013`
	STATUS	`approved` `editing`

#12 by R. J. Mathar at Thu Sep 19 15:11:45 EDT 2013

STATUS

editing

approved

Last modified August 18 23:05 EDT 2024. Contains 375284 sequences. (Running on oeis4.)