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A112748
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Smallest prime of the form 4 followed by n copies of k.
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1
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41, 433, 4111, 47777, 42323232323, 4999999, 479797979797979, 43333333333333333, 4232323232323232323, 439393939393939393939, 48383838383838383838383, 4272727272727272727272727, 41111111111111
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OFFSET
| 1,1
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EXAMPLE
| a(3) = 4111, 4 followed by three copies of 1.
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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: A112748 := proc(n) local a, k; for k from 1 do a := cat3(4, k, n) ; if isprime(a) then RETURN(a) ; fi ; od: end: seq(A112748(n), n=1..20) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
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CROSSREFS
| Sequence in context: A196807 A083761 A196784 * A173768 A061643 A037061
Adjacent sequences: A112745 A112746 A112747 * A112749 A112750 A112751
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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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