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A128302
The indices of cubes (of primes) in the 3-almost primes.
4
1, 5, 30, 82, 328, 551, 1243, 1763, 3112, 6276, 7619, 12972, 17615, 20322, 26514, 37977, 52220, 57703, 76200, 90701, 98470, 124541, 144229, 177395, 229275, 258410, 273908, 306750, 324149, 360724, 510225, 559384, 638657, 666743, 819645, 852588
OFFSET
1,2
COMMENTS
A014612(a(n)) = A030078(n) = A000040(n)^3.
EXAMPLE
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Feb 25 2007
STATUS
approved