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Search: id:A064938
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| A064938 |
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Nonprimes such that gcd(n, prime(n)^2 - 1) is n. |
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+0
1
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| 1, 4, 6, 8, 10, 12, 14, 20, 24, 42, 48, 60, 63, 70, 72, 80, 84, 108, 120, 124, 126, 153, 156, 182, 240, 246, 264, 286, 327, 372, 374, 440, 492, 516, 552, 1008, 1053, 1664, 1941, 2160, 2494, 3048, 3741, 4116, 4136, 4144, 4152, 5106, 5698, 6012, 6458, 6459
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,160
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MATHEMATICA
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Select[ Range[10^4], !PrimeQ[ # ] && GCD[ #, Prime[ # ]^2 - 1] == # & ]
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PROGRAM
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(PARI) { default(primelimit, 4294965247); n=0; for (m=1, 10^9, if (isprime(m), next); if (gcd(m, prime(m)^2 - 1) == m, write("b064938.txt", n++, " ", m); if (n==160, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 30 2009]
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CROSSREFS
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Cf. A064830.
Sequence in context: A141109 A061344 A066664 this_sequence A050990 A161546 A167179
Adjacent sequences: A064935 A064936 A064937 this_sequence A064939 A064940 A064941
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 26 2001
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