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Search: id:A048756
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| A048756 |
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Prime repunits in ascending prime bases (written in decimal). |
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+0
1
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OFFSET
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1,1
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COMMENT
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2^2-1=3 is prime; (3^3-1)/2=13 is prime; (5^13-1)/4=305175781 is prime; the next term is too gigantic to be computed simply.
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FORMULA
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a(p)=((p^a(p-1))-1)/(p-1); a(p)=111...111 in base p with a(p-1) 1's; p runs though the primes.
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CROSSREFS
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Sequence in context: A007523 A092830 A105291 this_sequence A157323 A016549 A147584
Adjacent sequences: A048753 A048754 A048755 this_sequence A048757 A048758 A048759
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KEYWORD
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nonn,bref
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AUTHOR
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Xavier Labouze (Xavier.Labouze(AT)cep.u-psud.fr)
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