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Search: id:A108159
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| A108159 |
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Numbers n such that (initial n digits of decimal expansion of 1/243)-1 is prime. |
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+0
1
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OFFSET
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1,1
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LINKS
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Eric Weisstein's World of Mathematics, 243.
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MATHEMATICA
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Do[ If[ PrimeQ[ Floor[10^n/243 - 1]], Print[n]], {n, 8000}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 10 2005)
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PROGRAM
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(PARI) for(n=1, 999, if(isprime(floor(1/243*10^n)-1), print1(n", ")))
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CROSSREFS
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Cf. A021247.
Sequence in context: A087306 A139964 A048797 this_sequence A067322 A042439 A030258
Adjacent sequences: A108156 A108157 A108158 this_sequence A108160 A108161 A108162
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KEYWORD
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more,nonn,base,bref,dumb
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jun 07 2005
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