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 A086381 Numbers n such that p=n^2+2 and p+2 are primes. 11
 1, 3, 15, 33, 45, 57, 117, 147, 243, 255, 303, 375, 423, 447, 453, 477, 573, 753, 837, 897, 903, 1035, 1497, 1905, 2055, 2085, 2193, 2283, 2433, 2487, 2535, 2583, 2757, 2823, 2943, 2955, 3003, 3213, 3285, 3345, 3603, 3657, 3687, 4407, 4575, 4977, 5037, 5043, 5325, 5355, 5367, 5403, 5727 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The twin primes are given by A253639 and A085554. Except for the initial term, all a(n)=3 (mod 6). - M. F. Hasler, Jan 16 2015 LINKS M. F. Hasler, Table of n, a(n) for n = 1..10000 FORMULA Intersection of A067201 and A007591. - M. F. Hasler, Jan 19 2015 PROG (Magma)[n: n in [0..10000]|IsPrime(n^2+2) and IsPrime(n^2+4)] // Vincenzo Librandi, Dec 16 2010 (PARI) is_A086381(x)=ispseudoprime(x^2+2)&&ispseudoprime(x^2+4) forstep(x=1, 9999, 2, is_A086381(x)&&print1(x", ")) \\ M. F. Hasler, Jan 16 2015 CROSSREFS Cf. A253639, A085554, A059100, A087475. Sequence in context: A358804 A152813 A184235 * A031091 A211441 A086380 Adjacent sequences: A086378 A086379 A086380 * A086382 A086383 A086384 KEYWORD easy,nonn AUTHOR Zak Seidov, Sep 07 2003 EXTENSIONS More terms from Vincenzo Librandi, Dec 16 2010 STATUS approved

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Last modified February 26 13:34 EST 2024. Contains 370352 sequences. (Running on oeis4.)