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Search: id:A141638
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| A141638 |
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Primes of the form c(c(c(i)-3)-3)-3, where A002808(i)=c(i)=i-th composite. |
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1
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| 7, 11, 13, 17, 19, 31, 37, 43, 59, 61, 79, 83, 97, 109, 137, 149, 151, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 251, 269, 293, 307, 313, 317, 337, 347, 349, 353, 373, 379, 383, 397, 419, 421, 431, 433, 443, 457, 461, 463, 467, 487, 491, 503, 509
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If i=1, then c(c(c(1)-3)-3)-3=c(4-3)-3=4-3=1 (nonprime).
If i=2, then c(c(c(2)-3)-3)-3=c(8-3)-3=c(5)-3=10-3=7=a(1).
If i=3, then c(c(c(3)-3)-3)-3=c(10-3)-3=c(7)-3=14-3=11=a(2).
If i=4, then c(c(c(4)-3)-3)-3=c(12-3)-3=c(9)-3=16-3=13=a(3).
If i=5, then c(c(c(5)-3)-3)-3=c(14-3)-3=c(11)-3=20-3=17=a(4),
etc.
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CROSSREFS
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Cf. A002808, A000040.
Sequence in context: A108811 A038961 A127903 this_sequence A141636 A098414 A110583
Adjacent sequences: A141635 A141636 A141637 this_sequence A141639 A141640 A141641
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Sep 03 2008
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EXTENSIONS
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79 inserted, 311 removed by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 05 2008
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