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a(1) = 1, a(n+1) is the smallest number such that there are n composite numbers between a(n) and a(n+1) exclusive.
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%I #5 Dec 05 2013 19:55:37

%S 1,5,9,15,22,29,37,47,57,70,85,99,117,133,151,170,190,213,236,260,287,

%T 311,337,365,395,426,459,493,527,560,597,636,676,715,756,797,841,886,

%U 929,975,1024,1074,1125,1174,1226,1277,1335,1387,1443,1504,1562,1625

%N a(1) = 1, a(n+1) is the smallest number such that there are n composite numbers between a(n) and a(n+1) exclusive.

%C Conjecture: there exists a prime between consecutive terms.

%Y Cf. A075342, A075344.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Sep 18 2002

%E More terms from _Sascha Kurz_, Jan 30 2003