A128302 - OEIS

%I #7 Mar 30 2012 17:36:44

%S 1,5,30,82,328,551,1243,1763,3112,6276,7619,12972,17615,20322,26514,

%T 37977,52220,57703,76200,90701,98470,124541,144229,177395,229275,

%U 258410,273908,306750,324149,360724,510225,559384,638657,666743,819645,852588

%N The indices of cubes (of primes) in the 3-almost primes.

%C A014612(a(n)) = A030078(n) = A000040(n)^3.

%H Zak Seidov, <a href="http://oeis.org/wiki/User_talk:Zak_Seidov#First_100_terms_in_A128302.">First 100 terms in A128302</a>

%e a(4) = 82 as 343=7^3=prime(4)^3, the fourth cube in the 3-almost primes, is the eighty-second 3-almost prime.

%Y Cf. A128301, A014612, A030078, A128303.

%K nonn

%O 1,2

%A _Rick L. Shepherd_, Feb 25 2007