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A062608 Numbers n such that 42^n - 41^n is prime. 1
2, 3, 5, 47, 67, 103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms greater than 1000 are often only strong pseudoprimes.

No further terms up to 5000. - Harvey P. Dale, Mar 13 2011]

a(7) > 10^5. - Robert Price, Sep 21 2012

LINKS

Table of n, a(n) for n=1..6.

MATHEMATICA

Select[Range[5000], PrimeQ[42^# - 41^#] &] (* Harvey P. Dale, Mar 13 2011 *)

PROG

(PARI) is(n)=ispseudoprime(42^n-41^n) \\ Charles R Greathouse IV, Jun 12 2017

CROSSREFS

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

Sequence in context: A208223 A136371 A060380 * A041791 A322947 A056720

Adjacent sequences:  A062605 A062606 A062607 * A062609 A062610 A062611

KEYWORD

nonn,hard

AUTHOR

Mike Oakes, May 18 2001, May 19 2001

STATUS

approved

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Last modified May 23 12:38 EDT 2019. Contains 323514 sequences. (Running on oeis4.)