A212582 Products of exactly three supersingular primes (A002267).

8, 12, 18, 20, 27, 28, 30, 42, 44, 45, 50, 52, 63, 66, 68, 70, 75, 76, 78, 92, 98, 99, 102, 105, 110, 114, 116, 117, 124, 125, 130, 138, 147, 153, 154, 164, 165, 170, 171, 174, 175, 182, 186, 188, 190, 195, 207, 230, 231, 236, 238, 242, 245, 246, 255, 261

Offset

1,1

Comments

The smallest "triprime" or "3-almost prime" not in this sequence is 148 = 2 * 2 * 37, as 37 is smallest prime which is not a supersingular prime.

Links

T. D. Noe, Table of n, a(n) for n = 1..680 (complete sequence)

Formula

i * j * k such that i, j, k are each in A002267, not necessarily distinct.

Mathematica

Union[Times @@@ Tuples[{2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, 47, 59, 71}, 3]] (* T. D. Noe, May 21 2012 *)

Crossrefs

Cf. A002267, A014612, A108764 (products of exactly two supersingular primes), A212554 (products of supersingular primes).

Sequence in context: A358763 A014612 A226527 * A046369 A066428 A228056

Adjacent sequences: A212579 A212580 A212581 * A212583 A212584 A212585

Keyword

nonn,easy,fini,full

Author

Jonathan Vos Post, May 21 2012

Status

approved