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A234238
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Sporadic solutions to sigma(n) == 12 modulo n.
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0
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24, 54, 121, 304, 780, 2352, 127744, 430272, 33501184, 184773312, 8589082624
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OFFSET
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1,1
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COMMENTS
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Terms of A076496 that are either not divisible by 6 or such that x/6 is not coprime to 6.
10384593717069654320312270165377024 is also a term. - Donovan Johnson, Dec 23 2013
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LINKS
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EXAMPLE
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sigma(24) % 24 = 12, and 24/6 is not coprime to 6, hence 24 is here.
sigma(121) % 121 = 12, and 121 is not divisible by 6, hence 121 is here.
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PROG
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(PARI) a(n) = m = 6; a = sigma(m) ; ((sigma(n) % n) == a) && ((n % m) || (!(n % m) && (gcd(m, (n/m)) != 1)));
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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