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Search: id:A160940
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| 2, 10, 95, 86, 2063, 26338, 1796701, 37907460, 1121781743, 624173160, 301508365839, 448445587666, 90026771795043, 1998858898554, 406702125332939256247, 78594656763841284, 186966120412500951787
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OFFSET
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1,1
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EXAMPLE
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Fourth row is 5, 11, 23, 47, so a(4) = 86.
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PROGRAM
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(MAGMA) f:=function(n) m:=1; while not IsPrime(m*n+1) do m+:=1; end while; return m*n+1; end function; [ &+[ k eq 1 select f(j) else f(Self(k-1)): k in [1..j] ]: j in [1..17] ];
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CROSSREFS
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Cf. A083809, A083810.
Sequence in context: A026025 A100622 A103436 this_sequence A132572 A069247 A087799
Adjacent sequences: A160937 A160938 A160939 this_sequence A160941 A160942 A160943
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KEYWORD
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nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 30 2009
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