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A108764 Products of exactly two supersingular primes (A002267). +0
1
4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, 58, 62, 65, 69, 77, 82, 85, 87, 91, 93, 94, 95, 115, 118, 119, 121, 123, 133, 141, 142, 143, 145, 155, 161, 169, 177, 187, 203, 205, 209, 213, 217, 221, 235, 247, 253, 287, 289, 295, 299 (list; graph; listen)
OFFSET

1,1

COMMENT

There are exactly 15 supersingular primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, 47, 59 and 71 (A002267). The supersingular primes are exactly the set of primes that divide the group order of the Monster group.

REFERENCES

Conway, J. H. and Norton, S. P. "Monstrous Moonshine." Bull. London Math. Soc. 11, 308-339, 1979.

Ogg, A. P. "Modular Functions." In The Santa Cruz Conference on Finite Groups. Held at the University of California, Santa Cruz, Calif., 1979 (Ed. B. Cooperstein and G. Mason). Providence, RI: Amer. Math. Soc., pp. 521-532, 1980.

Silverman, J. H. The Arithmetic of Elliptic Curves II. New York: Springer-Verlag, 1994.

LINKS

Eric Weisstein et al., Supersingular Prime.

FORMULA

{a(n)} = {p*q: p in A002267 and q in A002267}.

EXAMPLE

1207 = 17 * 71, 3337 = 47 * 71.

MATHEMATICA

t = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, 47, 59, 71}; Take[ Sort[ Flatten[ Table[ t[[i]]*t[[j]], {i, 15}, {j, i}]]], 60] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 28 2005)

CROSSREFS

Cf. A001358, A002267.

Sequence in context: A085155 A063762 A001358 this_sequence A129336 A103607 A108574

Adjacent sequences: A108761 A108762 A108763 this_sequence A108765 A108766 A108767

KEYWORD

easy,fini,nonn

AUTHOR

Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 17 2005

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.


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