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A098467 Numbers n such that 9999999999999999999999988888888888888888887777777777777777766666666666665555555555544444443333322211*2^n + 1 is prime. 0
19, 77, 99, 135, 163, 175, 219, 249, 367, 607, 651, 1005, 1355, 1487, 2341, 5509, 8667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

9999999999999999999999988888888888888888887777777777777777766666666666665555555555544444443333322211 is a 100-digit prime that is easy to remember: 23 9 then 19 8 then 17 7 then 13 5 then 11 4 then 7 3 then 5 2 end 2 1 p(9)9 p(8)8 p(7)7 p(6)6 p(5)5 p(4)4 p(3)3 p(2)2 p(1)1

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Cf. A098466.

Sequence in context: A244631 A304513 A041698 * A041700 A213832 A132234

Adjacent sequences:  A098464 A098465 A098466 * A098468 A098469 A098470

KEYWORD

nonn

AUTHOR

Pierre CAMI, Sep 09 2004

STATUS

approved

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Last modified January 19 18:27 EST 2019. Contains 319309 sequences. (Running on oeis4.)