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A228353 Primes of the form 3p - 4 where p is prime. 2
2, 5, 11, 17, 29, 47, 53, 83, 89, 107, 137, 173, 179, 197, 233, 263, 317, 389, 443, 449, 467, 569, 587, 593, 677, 683, 719, 809, 827, 839, 929, 947, 1097, 1163, 1187, 1223, 1259, 1289, 1367, 1433, 1493, 1523, 1559, 1619, 1637, 1667, 1709, 1847, 1889, 1973, 1979 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A003627. - Michel Marcus, May 30 2015

LINKS

Paolo P. Lava, Table of n, a(n) for n = 1..300

FORMULA

a(n) = 3*A258261(n)-4. Zak Seidov, May 24 2015

a(n) >> n*log^2 n. - _Charles R Greathouse IV, Jun 04 2015

MAPLE

P:= proc(q) local a, n; for n from 1 to q do a:=3*ithprime(n)-4; if isprime(a) then print(a); fi; od; end: P(1000); # Paolo P. Lava, Aug 21 2013

MATHEMATICA

Select[3*Prime[Range[200]]-4, PrimeQ] (* Zak Seidov, May 24 2015 *)

PROG

(PARI) is(n)=n%3==2 && isprime(n\3+2) && isprime(n) \\ Charles R Greathouse IV, Mar 18 2014

CROSSREFS

Cf. A228121, A258261, A003627.

Sequence in context: A064337 A076873 A089440 * A055499 A014424 A023228

Adjacent sequences:  A228350 A228351 A228352 * A228354 A228355 A228356

KEYWORD

nonn,less,easy

AUTHOR

Irina Gerasimova, Aug 20 2013

STATUS

approved

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Last modified June 6 13:31 EDT 2020. Contains 334827 sequences. (Running on oeis4.)