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Search: id:A097457
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| A097457 |
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If n is prime replace with the n-th composite otherwise replace with the n-th prime. |
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+0
1
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| 2, 4, 6, 7, 9, 13, 12, 19, 23, 29, 18, 37, 21, 43, 47, 53, 26, 61, 28, 71, 73, 79, 34, 89, 97, 101, 103, 107, 42, 113, 45, 131, 137, 139, 149, 151, 52, 163, 167, 173, 57, 181, 60, 193, 197, 199, 65, 223, 227, 229, 233, 239, 74, 251, 257, 263, 269, 271, 81, 281, 84, 293
(list; graph; listen)
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OFFSET
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2,1
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EXAMPLE
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4 is composite so replace it with prime(4) = 7 the 4-th entry in the table.
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PROGRAM
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(PARI) flipcomppr(n) = { for(x=1, n, if(isprime(x), y=composite(x), y=prime(x)); print1(y", ") ) } \ the n-th composite composite(n) = { local(c, x); c=1; x=0; while(c <= n, x++; if(!isprime(x), c++); ); return(x) }
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CROSSREFS
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Adjacent sequences: A097454 A097455 A097456 this_sequence A097458 A097459 A097460
Sequence in context: A076521 A139529 A141437 this_sequence A050095 A102528 A002158
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Aug 23 2004
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