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A233819 Least odd integer of each prime signature ordered by prime signatures occurrence. 3

%I #15 Jan 01 2024 10:01:57

%S 1,3,9,15,27,45,81,135,105,243,225,405,315,729,675,1215,945,2187,2025,

%T 1575,3645,1155,3375,2835,6561,6075,4725,10935,3465,10125,8505,19683,

%U 18225,14175,32805,10395,30375,11025,25515,59049,23625,54675,17325,50625,42525,98415,31185,91125,33075,76545,177147,70875

%N Least odd integer of each prime signature ordered by prime signatures occurrence.

%C a(n) is the least odd integer with the same prime signature as A025487(n).

%H Amiram Eldar, <a href="/A233819/b233819.txt">Table of n, a(n) for n = 1..10000</a>

%H Will Nicholes, <a href="http://willnicholes.com/math/primesiglist.htm">Prime Signatures</a>

%F a(n) = A003961(A025487(n)). - _Amiram Eldar_, Jun 23 2019

%e a(7) is the first odd integer with prime signature {1,3} = 3^3*5 = 135.

%e a(8) is the first odd integer with prime signature {1,1,1} = 3*5*7 = 105.

%Y Cf. A003961, A025487, A147516.

%K nonn

%O 1,2

%A _Lior Manor_, Dec 16 2013

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)