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A087270
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Solutions to GCD[x,pi[x]]=GCD[x, A000720(x)]>1. Numbers x such that x and pi(x) have common divisor larger than one.
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0
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4, 6, 8, 10, 14, 15, 16, 20, 22, 24, 27, 30, 33, 38, 39, 40, 44, 46, 48, 50, 51, 54, 56, 58, 62, 63, 64, 66, 72, 75, 77, 78, 80, 82, 90, 92, 93, 94, 96, 100, 102, 105, 108, 114, 115, 116, 117, 118, 120, 122, 123, 124, 125, 126, 132, 134, 136, 138, 140, 142, 144, 146
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| t=Table[GCD[w, PrimePi[w]], {w, 1, 1000}]; Flatten[Position[Sign[t-1], 1]]
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CROSSREFS
| Cf. A007053, A000720, A087266-A087269, A057809.
Sequence in context: A087684 A084808 A031020 * A075124 A067315 A069148
Adjacent sequences: A087267 A087268 A087269 * A087271 A087272 A087273
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Sep 16 2003
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