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A031378 a(n) = prime(4*n - 2). 3

%I #17 Sep 08 2022 08:44:50

%S 3,13,29,43,61,79,101,113,139,163,181,199,229,251,271,293,317,349,373,

%T 397,421,443,463,491,521,557,577,601,619,647,673,701,733,757,787,821,

%U 839,863,887,929,953,983,1013,1033,1061,1091,1109,1151,1181

%N a(n) = prime(4*n - 2).

%C A subsequence (more precisely, every other term) of A031215, subsequence of A007821 which is the complement of A006450 in the primes A000040. - _M. F. Hasler_, Oct 19 2013

%H Ivan Panchenko, <a href="/A031378/b031378.txt">Table of n, a(n) for n = 1..1000</a>

%F A031378(n) = A031215(2n-1) = A000040(2(2n-1)). - _M. F. Hasler_, Oct 19 2013

%t Prime[4*Range[50]-2] (* _Harvey P. Dale_, Jun 03 2014 *)

%o (Magma) [ NthPrime(4*n-2): n in [1..1000] ]; // _Vincenzo Librandi_, Apr 11 2011

%o (PARI) A031378=n->prime(n*4-2) \\ _M. F. Hasler_, Oct 19 2013

%K nonn

%O 1,1

%A _Jeff Burch_

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)