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A128302 The indices of cubes (of primes) in the 3-almost primes. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..36.

Zak Seidov, First 100 terms in A128302

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

Cf. A128301, A014612, A030078, A128303.

Sequence in context: A187275 A273480 A164015 * A258582 A288679 A071252

Adjacent sequences:  A128299 A128300 A128301 * A128303 A128304 A128305

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Feb 25 2007

STATUS

approved

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Last modified July 19 11:12 EDT 2019. Contains 325158 sequences. (Running on oeis4.)