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EXAMPLE
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Process: start with the natural numbers and then
delete every 2nd term:
(1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,...);
4 is missing, so delete every 4th term (7,15,23,...):
(1,3,5,9,11,13,17,19,21,25,27,29,...);
6 is missing, so delete every 6th term (13,29,...):
(1,3,5,9,11,17,19,21,25,27,...);
7 is missing, delete the 7th term (19,...):
(1,3,5,9,11,17,21,25,27,...);
8 is missing, delete the 8th term (25,...):
(1,3,5,9,11,17,21,27,...);
continue in this way to generate this sequence;
the missing terms form sequence A138204.
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