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a(1) = 1 and then group the composite numbers so that the n-th group contains n numbers with a prime sum: (1), (4, 9), (6, 8, 15), (10, 12, 14, 25), (16, 18, 20, 21, 22), ...
3

%I #4 Dec 05 2013 19:55:39

%S 1,4,9,6,8,15,10,12,14,25,16,18,20,21,22,24,26,27,28,30,32,33,34,35,

%T 36,38,39,42,40,44,45,46,48,49,50,51,52,54,55,56,57,58,60,62,69,63,64,

%U 65,66,68,70,72,74,75,84,76,77,78,80,81,82,85,86,87,88,91,90,92,93,94,95

%N a(1) = 1 and then group the composite numbers so that the n-th group contains n numbers with a prime sum: (1), (4, 9), (6, 8, 15), (10, 12, 14, 25), (16, 18, 20, 21, 22), ...

%e 1; 4,9; 6,8,15; 10,12,14,25; 16,18,20,21,22; ...

%Y Cf. A075636, A075637, A075638.

%K nonn,tabl

%O 1,2

%A _Amarnath Murthy_, Sep 30 2002

%E More terms from _David Wasserman_, Jan 22 2005