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A131937
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a(1)=1; a(2)=4. a(n) = a(n-1) + (nth positive integer which does not occur in sequence A131938).
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4
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1, 4, 8, 14, 21, 29, 38, 49, 61, 74, 88, 103, 120, 138, 157, 177, 198, 220, 244, 269, 295, 322, 350, 379, 409, 440, 473, 507, 542, 578, 615, 653, 692, 732, 773, 816, 860, 905, 951, 998, 1046, 1095, 1145, 1196, 1248, 1302, 1357, 1413, 1470, 1528, 1587, 1647
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| A131938: 2,5,10,16,23,32,42,53,...
Positive integers not in A131938: 1,3,4,6,7,8,9,11,...
So A131937(8) = A131937(7) + 11 = 49.
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CROSSREFS
| Cf. A131938.
Sequence in context: A055507 A121896 A173290 * A183857 A088804 A027924
Adjacent sequences: A131934 A131935 A131936 * A131938 A131939 A131940
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Jul 30 2007
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EXTENSIONS
| More terms from Farideh Firoozbakht (mymontain(AT)yahoo.com), Aug 07 2007
a(51)-a(52) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Mar 06 2010
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