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Search: id:A147667
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| A147667 |
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Primes of the form : 5^n-4^n. |
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1
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| 61, 1136791005963704961126617632861, 173472015290681763212224222187425603741981, 31861838222649045530727106406255616308752331078816472270207782250106896363274089\ 867800367051529351065966102374800998198276889145001421
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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5^3-4^3=125-64=61,...
n=prime numbers (3, 43, 59,...): if n is even (not p) then 5^n-4^n is divisible by 3. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Sep 20 2009]
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MATHEMATICA
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lst={}; Do[p=5^n-4^n; If[PrimeQ[p], AppendTo[lst, p]], {n, 6!}]; lst
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CROSSREFS
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Cf. A059802
Sequence in context: A068533 A093631 A087513 this_sequence A022084 A110823 A058913
Adjacent sequences: A147664 A147665 A147666 this_sequence A147668 A147669 A147670
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 10 2008
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