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 A321582 Primes p such that (4*p+1)/5 is prime. 2
 241, 421, 541, 571, 751, 1171, 1291, 1621, 1861, 2011, 2221, 2251, 2341, 2521, 2671, 2851, 2971, 3271, 3361, 3391, 3541, 3571, 3691, 4021, 4201, 4591, 4621, 4861, 5641, 5701, 5821, 6211, 6961, 7321, 7351, 7591, 7951, 8101, 8161, 8191, 8221, 8821, 8971, 9151, 9241, 9421 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subsequence of A320774. LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 EXAMPLE 241 is a term since it is prime and (4*241+1)/5 = 193, prime. MAPLE for n from 4 to 1000 do Y := ithprime(n); Z := 4*Y+1; K := (1/5)*Z; if mod(Z, 5) = 0 and isprime(K) then print(Y); end if: end do: MATHEMATICA Select[Prime[Range[1000]], PrimeQ[(4 # + 1)/5] &] (* Amiram Eldar, Nov 13 2018 *) CROSSREFS Cf. A320774. Sequence in context: A139502 A140629 A325088 * A137771 A108831 A068706 Adjacent sequences:  A321579 A321580 A321581 * A321583 A321584 A321585 KEYWORD nonn AUTHOR David James Sycamore, Nov 13 2018 EXTENSIONS More terms from Seiichi Manyama, Dec 24 2018 STATUS approved

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Last modified August 18 01:19 EDT 2019. Contains 326059 sequences. (Running on oeis4.)