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A062606 Numbers k such that 40^k - 39^k is prime. 0
2, 37, 61, 227, 1163, 2473 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms greater than 1000 are often only strong pseudoprimes.

No other terms less than 10^5. - Robert Price, Jul 24 2012

LINKS

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

PROG

(PARI) is(n)=ispseudoprime(40^n-39^n) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

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

Sequence in context: A162577 A199980 A063999 * A282639 A099533 A107752

Adjacent sequences:  A062603 A062604 A062605 * A062607 A062608 A062609

KEYWORD

nonn,hard

AUTHOR

Mike Oakes, May 18 2001, May 19 2001

STATUS

approved

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Last modified September 28 01:27 EDT 2021. Contains 347698 sequences. (Running on oeis4.)