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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A062652 Numbers k such that 86^k - 85^k is prime. 1 5, 11, 103, 227, 1637, 9677, 41597 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 COMMENTS Terms greater than 1000 are often only strong pseudoprimes. All terms are prime. - Robert Price, Apr 14 2014 a(8) > 10^5. - Robert Price, Apr 14 2015 LINKS Table of n, a(n) for n=1..7. MATHEMATICA Select[Range[0, 300], If[PrimeQ[#], PrimeQ[86^# - 85^#]] &] (* Robert Price, Apr 14 2015 *) PROG (PARI) is(n)=ispseudoprime(86^n-85^n) \\ Charles R Greathouse IV, Jun 12 2017 CROSSREFS Cf. A000043, A057468, A059801, A059802, A062572-A062666, A215536 (primes 87^n - 86^n). Sequence in context: A201074 A056111 A090160 * A075706 A338083 A236509 Adjacent sequences: A062649 A062650 A062651 * A062653 A062654 A062655 KEYWORD nonn,hard AUTHOR Mike Oakes, May 18 2001, May 19 2001 EXTENSIONS a(7) from Robert Price (computer run by Adam Marciniec), Apr 14 2015 STATUS approved

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Last modified August 29 09:16 EDT 2024. Contains 375511 sequences. (Running on oeis4.)