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A060272
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Distance from n^2 to closest prime.
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4
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1, 1, 2, 1, 2, 1, 2, 3, 2, 1, 6, 5, 2, 1, 2, 1, 4, 7, 2, 1, 2, 3, 6, 1, 6, 1, 2, 3, 2, 7, 6, 3, 2, 3, 2, 1, 2, 3, 2, 1, 12, 5, 2, 3, 2, 3, 2, 5, 2, 3, 8, 3, 6, 1, 2, 1, 2, 3, 10, 7, 2, 3, 2, 3, 4, 1, 4, 3, 2, 3, 2, 5, 4, 1, 2, 3, 2, 5, 6, 3, 2, 5, 6, 1, 4, 3, 4, 3, 2, 1, 6, 3, 2, 1, 4, 5, 4, 3, 2, 7, 8, 5, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(n)=abs(A000290(n)-A113425(n))=abs(A000290(n)-A113426(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 31 2005
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EXAMPLE
| n=1: n^2=1 is surrounded by primes {-2,2} and 2 is closer, so a(1)=1; n=11: n^2=121 is between primes {113,127} and closer to 127, thus a(11)=6.
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MAPLE
| [seq(min(nextprime(i^2)-i^2, i^2-prevprime(i^2)), i=2..256)]; n=1 computed separately.
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CROSSREFS
| Cf. A007491, A053001, A058043, A056927, A053000, A051700, A060268-A060269, A060272, A059959, A059790.
Sequence in context: A070966 A072504 A072499 * A174713 A129985 A085243
Adjacent sequences: A060269 A060270 A060271 * A060273 A060274 A060275
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Mar 23 2001
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