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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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1
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53, 577, 5333, 59999, 511111, 5111111111111, 59999999, 577777777, 5171717171717171717, 59999999999, 52727272727272727272727, 5111111111111, 53333333333333, 577777777777777, 5111111111111111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(3) = 5333, 5 followed by three copies of 3.
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MAPLE
| 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
| Sequence in context: A177120 A165555 A201855 * A177141 A096707 A027007
Adjacent sequences: A112746 A112747 A112748 * A112750 A112751 A112752
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 02 2006
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
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