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A126906 Smallest k such that 1 + k^(2*n+1)+Sum{j=1..n} k^(2*j) is prime. 0
1, 2, 1, 2, 1, 10, 17, 2, 1, 2, 1, 94, 122, 22, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

1 is a term if and only if number of terms in polynomial is prime

LINKS

Table of n, a(n) for n=1..15.

CROSSREFS

Cf. A124151, A119863, A049407, A124175 A124176 A124177, A124178, A124179, A124180, A124181, A126908-A126916.

Sequence in context: A071560 A248516 A097749 * A179508 A134304 A211096

Adjacent sequences:  A126903 A126904 A126905 * A126907 A126908 A126909

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 31 2006

STATUS

approved

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Last modified November 18 04:44 EST 2019. Contains 329248 sequences. (Running on oeis4.)