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A104197
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Largest nonnegative integer r such that Prime(n) + r and Prime(n) - r are both prime.
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0
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OFFSET
| 0,3
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COMMENTS
| a(n) can be thought of as the radius of the largest 1-dimensional circle centered at Prime(n) and consisting entirely of primes.
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EXAMPLE
| r = 4 is the largest nonnegative integer r such that Prime(4) + 4 = 11 and
Prime(4) - 4 = 3 are both prime; so a(4) = 4.
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CROSSREFS
| Sequence in context: A190751 A030232 A102024 * A189792 A189782 A047235
Adjacent sequences: A104194 A104195 A104196 * A104198 A104199 A104200
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KEYWORD
| easy,nonn
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AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Mar 12 2005
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