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A034923
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Numbers n such that 43^n-42 is prime.
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0
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OFFSET
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1,1
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COMMENTS
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Related to hyperperfect numbers of a certain form.
The 1017 term produces a 1662-digit number which is only a probable prime. Any additional terms are greater than 1500.
The next terms are > 3000. - Vincenzo Librandi, Sep 27 2012
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LINKS
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Table of n, a(n) for n=1..6.
J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3
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MATHEMATICA
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Select[Range[1500], PrimeQ[43^# - 42] &] (* Vincenzo Librandi, Sep 27 2012 *)
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PROG
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(PARI) for(n=2, 1500, if(isprime(43^n-42), print1(n, ", ")))
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CROSSREFS
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Sequence in context: A175349 A023644 A145387 * A013022 A012908 A077100
Adjacent sequences: A034920 A034921 A034922 * A034924 A034925 A034926
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KEYWORD
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nonn
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AUTHOR
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Jud McCranie
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EXTENSIONS
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One more term from Rick L. Shepherd, Jun 21 2002
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STATUS
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approved
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