STATUS
reviewed
approved
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Revision History for A141115
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Those positive integers k where both d(d(k)) is not coprime to k and d(d(k)) does not divide k, where d(k) is the number of divisors of k.
(history; published version)
(history; published version)
STATUS
proposed
reviewed
STATUS
editing
proposed
NAME
Those positive integers n k where both d(d(nk)) is not coprime to n k and d(d(nk)) does not divide n, k, where d(nk) is the number of divisors of nk.
LINKS
Amiram Eldar, <a href="/A141115/b141115.txt">Table of n, a(n) for n = 1..10000</a>
STATUS
approved
editing
STATUS
editing
approved
MATHEMATICA
Select[Range[400], GCD[DivisorSigma[0, DivisorSigma[0, # ]], # ] > 1 && Mod[ #, DivisorSigma[0, DivisorSigma[0, # ]]] > 0 &] - _(* _Stefan Steinerberger_, Jun 05 2008 *)
STATUS
approved
editing
AUTHOR
Leroy Quet , Jun 04 2008
AUTHOR
_Leroy Quet _ Jun 04 2008
MATHEMATICA
Select[Range[400], GCD[DivisorSigma[0, DivisorSigma[0, # ]], # ] > 1 && Mod[ #, DivisorSigma[0, DivisorSigma[0, # ]]] > 0 &] - _Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), _, Jun 05 2008
EXTENSIONS
More terms from _Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), _, Jun 05 2008