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a(1)=2; a(2)=5. a(n) = a(n-1) + (n-th positive integer which does not occur in sequence A131937).
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%I #9 Apr 09 2014 10:15:19

%S 2,5,10,16,23,32,42,53,65,78,93,109,126,144,163,183,205,228,252,277,

%T 303,330,358,388,419,451,484,518,553,589,626,665,705,746,788,831,875,

%U 920,966,1013,1061,1111,1162,1214,1267,1321,1376,1432,1489,1547,1606,1666

%N a(1)=2; a(2)=5. a(n) = a(n-1) + (n-th positive integer which does not occur in sequence A131937).

%e A131937: 1,4,8,14,21,29,...

%e Positive integers not in A131937: 2,3,5,6,7,9,10,11,...

%e So A131938(8) = A131938(7) + 11 = 53.

%Y Cf. A131937.

%K nonn

%O 1,1

%A _Leroy Quet_, Jul 30 2007

%E More terms from _Farideh Firoozbakht_, Aug 07 2007

%E a(51)-a(52) from _Ray Chandler_, Mar 06 2010