A174848 - OEIS

%I #2 Mar 30 2012 18:51:05

%S 330,330,43890,2310,210,53130,2310,9690,53130,2310,3570,79170,30030,

%T 1360590,53130,53130,30030,43890,177521190,1607970,11741730,690690,

%U 75992317170,340510170,325046311590,1618964990108856390

%N Squarefree kernels of orders of sporadic simple groups.

%C a(n) = A007947(A001228(n)).

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SporadicGroup.html">Sporadic Group</a>

%e a(1) = 2*3*5*11;

%e a(2) = 2*3*5*11;

%e a(3) = 2*3*5*7*11*19;

%e a(4) = 2*3*5*7*11 = 11#;

%e a(5) = 2*3*5*7 = 7#;

%e a(6) = 2*3*5*7*11*23;

%e a(7) = 2*3*5*7*11 = 11#;

%e a(8) = 2*3*5*17*19;

%e a(9) = 2*3*5*7*11*23;

%e a(10) = 2*3*5*7*11 = 11#;

%e a(11) = 2*3*5*7*17;

%e a(12) = 2*3*5*7*13*29;

%e a(13) = 2*3*5*7*11*13 = 13#;

%e a(14) = 2*3*5*7*11*19*31;

%e a(15) = 2*3*5*7*11*23;

%e a(16) = 2*3*5*7*11*23;

%e a(17) = 2*3*5*7*11*13 = 13#;

%e a(18) = 2*3*5*7*11*19;

%e a(19) = 2*3*5*7*11*31*37*67;

%e a(20) = 2*3*5*7*13*19*31;

%e a(21) = 2*3*5*7*11*13*17*23;

%e a(22) = 2*3*5*7*11*13*23;

%e a(23) = 2*3*5*7*11*23*29*31*37*43;

%e a(24) = 2*3*5*7*11*13*17*23*29;

%e a(25) = 2*3*5*7*11*13*17*19*23*31*47;

%e a(26) = PROD(A002267(k): 1<=k<=15) = 2*3*5*7*11*13*17*19*23*29*31*41*47*59*71.

%Y Cf. A174670.

%K fini,full,nonn

%O 1,1

%A _Reinhard Zumkeller_, Apr 02 2010