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A104165 Sophie Germain type primes where 7*Prime[n]=2*Prime[m]+1. 0
17, 59, 101, 311, 353, 479, 521, 941, 983, 1109, 1361, 1571, 1613, 1823, 1949, 2243, 2663, 2789, 2999, 3083, 3251, 3671, 3881, 4133, 4259, 4931, 5939, 5981, 6569, 6653, 7283, 7451, 7829, 8039, 8081, 8543, 8669, 9173, 9551, 9719, 9803, 9929, 10139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..43.

FORMULA

a(n) = If (7*Prime[n]-1)/2 is prime, then a[m]=(7*Prime[n]-1)/2

MATHEMATICA

a = Delete[Union[Table[If [PrimeQ[(7*Prime[n] - 1)/2] == True, (7*Prime[n] - 1)/2, 0], {n, 1, 1000}]], 1]

CROSSREFS

Cf. Sophie Germain primes: A005384.

Sequence in context: A106922 A110092 A141896 * A031391 A176783 A086816

Adjacent sequences:  A104162 A104163 A104164 * A104166 A104167 A104168

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Mar 10 2005

STATUS

approved

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Last modified December 15 20:00 EST 2019. Contains 330000 sequences. (Running on oeis4.)