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Search: id:A112749
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| A112749 |
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Smallest prime of the form 5 followed by n copies of some digit k. |
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+0
1
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| 53, 577, 5333, 59999, 511111, 5111111111111, 59999999, 577777777, 5171717171717171717, 59999999999, 52727272727272727272727, 5111111111111, 53333333333333, 577777777777777, 5111111111111111
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(3) = 5333, 5 followed by three copies of 3.
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MAPLE
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cat3 := proc(a, b, n) local resu, i ; resu := a ; for i from 1 to n do resu := resu*10^( max(1, ilog10(b)+1) )+b ; od: RETURN(resu) ; end: A112749 := proc(n) local a, k; for k from 1 do a := cat3(5, k, n) ; if isprime(a) then RETURN(a) ; fi ; od: end: seq(A112749(n), n=1..20) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
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CROSSREFS
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Sequence in context: A053736 A142209 A165555 this_sequence A096707 A027007 A142780
Adjacent sequences: A112746 A112747 A112748 this_sequence A112750 A112751 A112752
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 02 2006
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
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