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Search: id:A018253
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OFFSET
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1,2
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COMMENT
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The divisors of 24 greater than 1 are the only positive integers n with the property m^2 == 1 (mod n) for all integer m coprime to n. - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jun 10 2001
n for which all Dirichlet characters are real. - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2002
These are the numbers n that are divisible by all numbers less than or equal to square root of n. - Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 10 2006
Also, numbers n such that A160812(n) = 0. Also, numbers n such that A160813(n) = 0. - Omar E. Pol (info(AT)polprimos.com), Jun 19 2009
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REFERENCES
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Harvey Cohn, "Advanced Number Theory", Dover, chap.II, p. 38
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LINKS
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M. H. Eggar, A curious property of the integer 24, Math. Gazette, vol. 84, 2000, 96-97.
Eric Weisstein's World of Mathematics, Modulo Multiplication Group
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FORMULA
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a(n) = A161710(n-1). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 21 2009]
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PROGRAM
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(Other) sage: divisors(24); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 13 2009]
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CROSSREFS
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Sequence in context: A007886 A135108 A018515 this_sequence A160810 A143417 A018597
Adjacent sequences: A018250 A018251 A018252 this_sequence A018254 A018255 A018256
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KEYWORD
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nonn,fini,full
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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