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%I #4 Dec 05 2013 19:55:36
%S 1,2,4,6,7,8,10,11,12,14,15,16,17,19,20,22,23,24,25,26,28,29,31,32,33,
%T 34,36,37,38,39,40,41,42,44,45,47,48,49,50,51,52,54,55,56,57,59,60,61,
%U 63,64,65,66,68,69,70,71,72,73,74,76,77,78,79,80,81,83,84,86,87,88,89
%N Pair the natural numbers such that the n-th pair is (k, k+prime(n)) where k is the smallest number not occurring earlier and prime(n) is the n-th prime. (1, 3), (2, 5), (4, 9), (6, 13), (7, 18), (8, 21), (10, 27), (11, 30), (12, 35), (14, 43), ... This is the sequence of the first member of every pair.
%Y Cf. A075314, A075315, A075316.
%K nonn
%O 1,2
%A _Amarnath Murthy_, Sep 14 2002
%E More terms from _David Wasserman_, Jan 16 2005
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