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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A212582 Products of exactly three supersingular primes (A002267).

Original entry on oeis.org

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

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Author

Jonathan Vos Post, May 21 2012

Keywords

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

Crossrefs

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

Programs

  • 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 *)

Formula

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