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Search: id:A097453
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| A097453 |
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Primes p of the form p = prime(k) - composite(k) for some k. |
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+0
1
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| 2, 3, 5, 5, 13, 13, 17, 23, 41, 41, 61, 67, 67, 89, 109, 131, 131, 157, 163, 167, 167, 181, 191, 191, 199, 199, 227, 263, 269, 281, 367, 409, 433, 433, 457, 467, 503, 503, 569, 593, 617, 641, 709, 761, 811, 839, 859, 859, 883, 887, 1019, 1033, 1033, 1117, 1193
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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The 10-th prime is 29, the 10-th composite is 16. 29+16=13 the 5-th entry in the table.
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PROGRAM
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(PARI) primepcomp(n) = { for(x=5, n, y=prime(x)- composite(x); if(isprime(y), 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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Sequence in context: A050368 A156834 A079024 this_sequence A079125 A146305 A079022
Adjacent sequences: A097450 A097451 A097452 this_sequence A097454 A097455 A097456
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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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