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A062648 Numbers n such that 82^n - 81^n is prime. 0
2, 3, 13, 787, 797, 857, 1613, 37337 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms greater than 1000 are often only strong pseudoprimes.

a(9) > 10^5. - Robert Price, Jan 28 2015

LINKS

Table of n, a(n) for n=1..8.

MATHEMATICA

Select[Range[1000], PrimeQ[82^# - 81^#] &] (* Robert Price, Jan 28 2015 *)

PROG

(PARI) is(n)=ispseudoprime(82^n-81^n) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572-A062666.

Sequence in context: A132484 A258357 A160858 * A094003 A119987 A093553

Adjacent sequences:  A062645 A062646 A062647 * A062649 A062650 A062651

KEYWORD

nonn,hard

AUTHOR

Mike Oakes, May 18 2001, May 19 2001

EXTENSIONS

a(8) from Robert Price, Jan 28 2015

STATUS

approved

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Last modified June 21 15:12 EDT 2021. Contains 345364 sequences. (Running on oeis4.)