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A067289 Numbers k such that the number of divisors of k is floor(prime(k)/k). 1

%I #14 Apr 24 2022 02:29:57

%S 5,7,11,25,33,34,35,38,39,46,51,55,57,58,62,65,81,207,212,236,242,243,

%T 244,245,261,268,275,279,284,292,316,325,332,333,338,356,363,369,387,

%U 388,404,412,423,425,428,436,729,1065,1066,1070,1074,1085,1086,1090

%N Numbers k such that the number of divisors of k is floor(prime(k)/k).

%H Amiram Eldar, <a href="/A067289/b067289.txt">Table of n, a(n) for n = 1..10000</a>

%F Numbers k such that A000005(k) = floor(prime(k)/k).

%t Select[Range[1000], DivisorSigma[0, #] == Floor[Prime[#]/#] &] (* _Amiram Eldar_, Apr 23 2022 *)

%Y Cf. A000005, A038605.

%K nonn

%O 1,1

%A _Benoit Cloitre_, Feb 24 2002

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Last modified August 14 02:14 EDT 2024. Contains 375146 sequences. (Running on oeis4.)