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Search: id:A032352
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| A032352 |
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Numbers n such that there is no prime between 10*n and 10*n+9. |
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+0
5
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| 20, 32, 51, 53, 62, 84, 89, 107, 113, 114, 126, 133, 134, 135, 141, 146, 150, 164, 167, 168, 171, 176, 179, 185, 189, 192, 196, 204, 207, 210, 218, 219, 232, 236, 240, 248, 249, 251, 256, 258, 282, 294, 298, 305, 309, 314, 315, 317, 323, 324, 326, 328
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Numbers n with property that appending any single decimal digit to n does not produce a prime.
A007920(n*10) > 10.
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EXAMPLE
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m=32: 321=3*107, 323=17*19, 325=5*5*13, 327=3*109, 329=7*47, therefore 32 is a term.
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MAPLE
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a:=proc(n) if map(isprime, {seq(10*n+j, j=1..9)})={false} then n else fi end: seq(a(n), n=1..350); (Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 01 2005)
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MATHEMATICA
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f[n_] := PrimePi[10n + 10] - PrimePi[10n]; Select[ Range[342], f[ # ] == 0 &] (from Robert G. Wilson v Sep 24 2004)
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CROSSREFS
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Sequence in context: A077343 A116131 A075035 this_sequence A124665 A134989 A119873
Adjacent sequences: A032349 A032350 A032351 this_sequence A032353 A032354 A032355
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KEYWORD
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nonn
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AUTHOR
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Jeff Burch (jmburch(AT)osprey.smcm.edu)
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EXTENSIONS
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More terms from Miklos Kristof (kristmikl(AT)freemail.hu), Aug 27 2002
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