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%I #24 Aug 28 2018 03:23:21
%S 11,17,29,41,47,59,67,97,107,127,137,149,167,179,197,227,263,281,307,
%T 347,367,401,431,461,487,503,521,569,587,617,641,677,719,739,751,769,
%U 809,821,853,881,907,937,967,983,1009,1019,1049,1087,1097,1117,1151,1163,1187,1217,1229,1249,1277
%N The smallest prime in some interval of the form (2*prime(k),2*prime(k+1)) if this interval contains at least 2 primes.
%C These are called "right primes" in A166251.
%H Vincenzo Librandi, <a href="/A166307/b166307.txt">Table of n, a(n) for n = 1..1000</a>
%e For p=29 we have: 2*13 < 29 < 2*17 and interval (26, 29) is free from primes while interval (29, 34) contains a prime. Therefore 29 is in the sequence for k=6.
%t f[n_] := Block[{t = Select[ Table[i, {i, 2 Prime[n], 2 Prime[n + 1]}], PrimeQ]}, If[ Length@ t > 1, t[[1]], 0]]; Rest@ Union@ Array[f, 115] (* _Robert G. Wilson v_, May 08 2011 *)
%Y Cf. A166252, A166251, A164368, A104272, A080359, A164333, A164288, A164294, A164554, A182365.
%K nonn
%O 1,1
%A _Vladimir Shevelev_, Oct 11 2009, Oct 17 2009
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