A128302 The indices of cubes (of primes) in the 3-almost primes.

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.

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: A344070 A273480 A164015 * A258582 A288679 A071252

Adjacent sequences: A128299 A128300 A128301 * A128303 A128304 A128305

Keyword

nonn

Author

Rick L. Shepherd, Feb 25 2007

Status

approved