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A110905 Least number k such that k*p(n)#-1 is prime and (k*p(n)#-1)^2-2 is a Chen prime. 0
2, 1, 1, 11, 1, 6, 41, 17, 8, 13, 14, 107, 84, 23, 4, 101, 13, 89, 211, 58, 83, 75, 260, 414, 35, 39, 871, 79, 27, 42, 915, 44, 349, 142, 249, 404, 140, 84, 1068, 693, 972, 236, 1571, 1200, 298, 423, 970, 183, 173, 659, 523, 645, 1596, 448, 40, 201, 195, 1859, 427, 1732 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..60.

EXAMPLE

2*2-1=3, (2*2-1)^2-2=7 3 and 7 primes so k(1)=2

11*2*3*5*7-1=2309, (11*2*3*5*7-1)^2-2=5331479 2309 and 5331479 primes so k(4)=11

CROSSREFS

Sequence in context: A064307 A165883 A260950 * A205447 A297544 A297802

Adjacent sequences:  A110902 A110903 A110904 * A110906 A110907 A110908

KEYWORD

nonn

AUTHOR

Pierre CAMI, Sep 21 2005

STATUS

approved

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Last modified October 20 11:43 EDT 2018. Contains 316379 sequences. (Running on oeis4.)