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Search: id:A102873
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| A102873 |
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Prime differences between 2^n and 3^m when they are nearly equal for n and m to 200. |
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+0
1
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| 5, 7, 13, 47, 502829, 95622386615329600236050591, 31282850202880064644204601069, 463689046302626373360766753609741, 15491551101739718820967497643203613
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The first array "c" can be used to extend A102872. d = Delete[Union[Table[If[PrimeQ[c[[n]]], c[[n]], 0], {n, 1, Length[c]}]], 1] finds the primes in this line between 2^n and 3^m.
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FORMULA
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a(q) = If 2^n and 3^m are such that 2^n>3^n and Floor[2^n/3^m]<2 and when Abs[2^n-3^m] if prime, then a[q]=Abs[2^n-3^m]
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MATHEMATICA
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c = Delete[Union[Flatten[Table[Table[If [ (2^n > 3^m) && Floor[2^n/3^m] < 2, Abs[2^n - 3^m], 0], {m, 1, n}], {n, 1, 200}], 1]], 1] d = Delete[Union[Table[If[PrimeQ[c[[n]]], c[[n]], 0], {n, 1, Length[c]}]], 1]
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CROSSREFS
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Adjacent sequences: A102870 A102871 A102872 this_sequence A102874 A102875 A102876
Sequence in context: A109904 A077781 A102872 this_sequence A106022 A050085 A105638
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KEYWORD
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nonn
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AUTHOR
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Roger Lee Bagula (rlbagulatftn(AT)yahoo.com), Mar 01 2005
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EXTENSIONS
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Is this well-defined? "Up to 200" bothers me. - njas
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