login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A072412 Numbers k such that the LCM of exponents in the prime factorization of k does not equal the largest exponent. 2

%I

%S 72,108,200,288,360,392,432,500,504,540,600,648,675,756,792,800,864,

%T 936,968,972,1125,1152,1176,1188,1224,1323,1350,1352,1368,1372,1400,

%U 1404,1440,1500,1568,1656,1800,1836,1944,1960,2000,2016,2052,2088,2160

%N Numbers k such that the LCM of exponents in the prime factorization of k does not equal the largest exponent.

%C This sequence differs from the Achilles numbers (A052486).

%F A051903(a(n)) != A072411(a(n)).

%e k = 360 = 2*2*2*3*3*5, exponent set = {3,2,1}; LCM=6, max=3.

%o (PARI) is(n)=my(f=factor(n)[,2]); n>9 && vecmax(f)!=lcm(f) \\ _Charles R Greathouse IV_, Oct 16 2015

%Y Cf. A005361, A051903, A051904, A052409, A052486, A072411-A072414.

%K nonn

%O 1,1

%A _Labos Elemer_, Jun 17 2002

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 14 13:50 EDT 2021. Contains 343884 sequences. (Running on oeis4.)