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A000864
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Deceptive nonprimes: composite numbers n such that n divides the repunit R_{n-1}.
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1
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91, 259, 451, 481, 703, 1729, 2821, 2981, 3367, 4141, 4187, 5461, 6533, 6541, 6601, 7471, 7777, 8149, 8401, 8911, 10001, 11111, 12403, 13981, 14701, 14911, 15211, 15841, 19201, 21931, 22321, 24013, 24661, 27613, 29341, 34133
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Francis and Ray call these numbers "deceptive primes".
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LINKS
| R. Francis and T. Ray, The deceptive primes to 2.10^7, Missouri J. Math. Sci. 12 (2000), no. 3, 145-158.
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
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PROG
| (PARI) p=5; forprime(q=7, 1e5, forstep(n=p+2, q-2, 2, if(n%5==0, next); if(Mod(10, 9*n)^(n-1)==1, print1(n", "))); p=q) \\ Charles R Greathouse IV, Jul 31 2011
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CROSSREFS
| Sequence in context: A044423 A044804 A051973 * A020441 A063137 A180942
Adjacent sequences: A000861 A000862 A000863 * A000865 A000866 A000867
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KEYWORD
| nonn
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AUTHOR
| Tim Ray (C268SCM(AT)SEMOVM.SEMO.EDU)
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