OFFSET
1,1
COMMENTS
All the terms in this sequence are primes, but none are congruent to 9 mod 10.
All terms == 1 (mod 7). - Robert Israel, Jul 22 2014
LINKS
K. D. Bajpai, Table of n, a(n) for n = 1..13520
EXAMPLE
n = 2: n^6 - n^5 + n^4 - n^3 + n^2 - n + 1 = 43, which is prime.
n = 10: n^6 - n^5 + n^4 - n^3 + n^2 - n + 1 = 909091, which is prime.
MATHEMATICA
Select[Table[n^6 - n^5 + n^4 - n^3 + n^2 - n + 1, {n, 200}], PrimeQ]
CROSSREFS
KEYWORD
nonn
AUTHOR
K. D. Bajpai, Jul 21 2014
STATUS
approved