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Search: id:A139186
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| A139186 |
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Indices of smaller factorial twin primes (smaller positive k that (k!-n)/n and (k!+n)/n are primes). |
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+0
3
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OFFSET
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1,1
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COMMENT
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Smaller from pair of smallest factorial twin primes see A139187
Larger of pair of smallest factorial twin primes see A139188
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MATHEMATICA
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a = {}; Do[k = 1; While[ ! (PrimeQ[(k! - n)/n] && PrimeQ[(k! + n)/n]), k++ ]; AppendTo[a, k]; Print[a], {n, 1, 6}]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A139187, A139188.
Adjacent sequences: A139183 A139184 A139185 this_sequence A139187 A139188 A139189
Sequence in context: A101432 A098744 A023823 this_sequence A047840 A037189 A083342
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KEYWORD
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nonn,uned
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008
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