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Search: id:A112748
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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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+0
1
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| 41, 433, 4111, 47777, 42323232323, 4999999, 479797979797979, 43333333333333333, 4232323232323232323, 439393939393939393939, 48383838383838383838383, 4272727272727272727272727, 41111111111111
(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) = 4111, 4 followed by three copies of 1.
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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: 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
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Sequence in context: A008356 A068849 A083761 this_sequence A061643 A037061 A103735
Adjacent sequences: A112745 A112746 A112747 this_sequence A112749 A112750 A112751
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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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