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Search: id:A118570
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| A118570 |
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Very lucky numbers : apply the sieve to obtain the lucky numbers (A000959) on the lucky numbers themselves. |
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+0
1
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| 1, 3, 9, 13, 21, 25, 33, 37, 51, 67, 69, 75, 93, 99, 111, 129, 133, 141, 151, 163, 189, 193, 205, 223, 237, 259, 261, 273, 289, 297, 307, 319, 331, 357, 385, 393, 415, 429, 433, 463, 483, 487, 495, 519, 529, 537, 577, 583, 591, 613, 621, 631, 643
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Start with the lucky numbers (A000959). After the initial 1, the first number is 3. So delete every 3rd number, leaving 1 3 9 13 ...; the next number remaining is 9, so delete every 9nd number, leaving 1 3 9 13 21 25 33 ...; now delete every 13th number, then delete every 21st number; etc. It would be interesting to know the density of those numbers.
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CROSSREFS
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Cf. A000959.
Sequence in context: A095234 A032415 A075318 this_sequence A004617 A135370 A022408
Adjacent sequences: A118567 A118568 A118569 this_sequence A118571 A118572 A118573
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KEYWORD
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base,nonn
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AUTHOR
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Luc Stevens (lms022(AT)yahoo.com), May 07 2006
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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 01 2006
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