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A291990
Primes of the form Phi(k, -10), where Phi is the cyclotomic polynomial.
1
101, 9091, 909091, 9901, 909090909090909091, 99990001, 909090909090909090909090909091, 999999000001, 1111111111111111111, 11111111111111111111111, 9999999900000001, 9090909090909090909090909090909090909090909090909091
OFFSET
1,1
MATHEMATICA
Select[Table[Cyclotomic[k, -10], {k, 3, 100}], PrimeQ[#] &]
CROSSREFS
Cf. A138920.
Sequence in context: A017764 A217677 A333689 * A303572 A152756 A265172
KEYWORD
nonn
AUTHOR
Robert Price, Sep 07 2017
STATUS
approved