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A087749
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Primes n such that 6^n-5^n is composite.
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0
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3, 7, 17, 19, 29, 31, 37, 41, 43, 47, 53, 59, 67, 71, 73, 79, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| Select[Prime[Range[60]], !PrimeQ[6^#-5^#]&] (* From Harvey P. Dale, Apr 26 2011 *)
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PROG
| (PARI) apmb(a, b, n) = { forprime(x=2, n, y=a^x-b^x; if(!ispseudoprime(y), print1(x", "); ) ) }
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CROSSREFS
| Sequence in context: A133593 A191147 A058887 * A140863 A076194 A167168
Adjacent sequences: A087746 A087747 A087748 * A087750 A087751 A087752
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KEYWORD
| nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Oct 26 2003
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EXTENSIONS
| Corrected by Andrew Plewe (aplewe(AT)sbcglobal.net), Apr 24 2007 (all the terms were wrong)
Checked by Ray Chandler, Apr 25 2007
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