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Search: id:A081317
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| A081317 |
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Primes p such that p divides 10^n-1, p is the largest prime producing decimal fraction period n and p is not the largest prime dividing 10^n-1. |
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+0
2
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| 13, 52579, 8779, 2161, 69857, 909090909090909091, 459691, 549797184491917, 14175966169, 183411838171, 296557347313446299, 388847808493, 3404193829806058997303, 8985695684401, 297262705009139006771611927
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OFFSET
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1,1
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LINKS
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Sam Wagstaff, The Cunningham Project, The Main Tables
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FORMULA
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Numbers in A061075(n) such that A061075(n) /= A005422(n). The corresponding values of n are given in A081318.
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EXAMPLE
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a(1)=13 because the largest factor 37 in the factorization of 10^6-1=999999=3^3*7*11*13*37 already occurs in the factorization of 10^3-1=3^3*37 and produces only a decimal fraction period of 3. 1/37=0.027027027...., 1/13=0.0769230769230...
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CROSSREFS
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Cf. A005422, A003020, A061075, A081318.
Sequence in context: A013752 A076811 A048917 this_sequence A027680 A022547 A013798
Adjacent sequences: A081314 A081315 A081316 this_sequence A081318 A081319 A081320
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KEYWORD
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nonn
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AUTHOR
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Hugo Pfoertner (hugo(AT)pfoertner.org), Mar 18 2003
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EXTENSIONS
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More terms from Hans Havermann (pxp(AT)rogers.com), May 31 2003
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