

A212582


Products of exactly three supersingular primes (A002267).


1



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
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OFFSET

1,1


COMMENTS

The smallest "triprime" or "3almost 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: A145784 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



