

A131938


a(1)=2; a(2)=5. a(n) = a(n1) + (nth positive integer which does not occur in sequence A131937).


4



2, 5, 10, 16, 23, 32, 42, 53, 65, 78, 93, 109, 126, 144, 163, 183, 205, 228, 252, 277, 303, 330, 358, 388, 419, 451, 484, 518, 553, 589, 626, 665, 705, 746, 788, 831, 875, 920, 966, 1013, 1061, 1111, 1162, 1214, 1267, 1321, 1376, 1432, 1489, 1547, 1606, 1666
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..52.


EXAMPLE

A131937: 1,4,8,14,21,29,...
Positive integers not in A131937: 2,3,5,6,7,9,10,11,...
So A131938(8) = A131938(7) + 11 = 53.


CROSSREFS

Cf. A131937.
Sequence in context: A135061 A323624 A086849 * A031871 A026056 A267159
Adjacent sequences: A131935 A131936 A131937 * A131939 A131940 A131941


KEYWORD

nonn


AUTHOR

Leroy Quet, Jul 30 2007


EXTENSIONS

More terms from Farideh Firoozbakht, Aug 07 2007
a(51)a(52) from Ray Chandler, Mar 06 2010


STATUS

approved



