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Search: id:A102617
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| A102617 |
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Primes p(n) such that n is a second order nonprime number. |
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+0
1
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| 2, 19, 29, 43, 47, 53, 71, 79, 89, 97, 103, 113, 131, 137, 149, 151, 163, 167, 173, 193, 199, 223, 227, 229, 233, 251, 257, 263, 271, 293, 307, 311, 317, 337, 347, 349, 359, 379, 383, 389, 397, 409, 421, 439, 443, 449, 457, 463, 479, 487, 491, 503, 523, 541
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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Nonprime(4) = 8.
The 8-th prime is 19, the second entry.
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MATHEMATICA
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nonPrime[n_Integer] := FixedPoint[n + PrimePi[ # ] &, n]; Prime /@ nonPrime /@ nonPrime /@ Range[54] (from Robert G. Wilson v Feb 04 2005)
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PROGRAM
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(PARI) \We perform nesting(s) with a loop. cips(n, m) = { local(x, y, z); for(x=1, n, z=x; for(y=1, m+1, z=composite(z); ); print1(prime(z)", ") ) } composite(n) = \ The n-th composite number. 1 is defined as a composite number. { 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: A004023 A031030 A083689 this_sequence A120276 A006962 A090819
Adjacent sequences: A102614 A102615 A102616 this_sequence A102618 A102619 A102620
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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), Jan 31 2005
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 04 2005
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