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#22 by N. J. A. Sloane at Fri Dec 15 17:35:58 EST 2017
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| EXTENSIONS
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More terms from _Jason Earls (zevi_35711(AT)yahoo.com), _, Aug 26 2002
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Discussion
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| Fri Dec 15
| 17:35
| OEIS Server: https://oeis.org/edit/global/2722
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#21 by Michel Marcus at Sun Mar 06 04:06:48 EST 2016
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#20 by Joerg Arndt at Sun Mar 06 03:54:28 EST 2016
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#19 by Ivan Neretin at Sun Mar 06 03:41:39 EST 2016
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Discussion
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| Sun Mar 06
| 03:54
| Joerg Arndt: Thanks!
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#18 by Ivan Neretin at Sun Mar 06 03:41:32 EST 2016
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#17 by Joerg Arndt at Sun Mar 06 03:18:44 EST 2016
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| FORMULA
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a[1]=1; a[n_]:=a[n]=(For[c=Sort[Table[a[k], {k, n-1}]]; d=Append[c, Last[c]+1]; m=First[Complement[Range[Last[d]], c]], MemberQ[c, m]||!PrimeQ[m*a[n-1]+1], m++ ];m) (Farideh Firoozbakht, Apr 14 2004)
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| STATUS
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proposed
editing
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Discussion
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| Sun Mar 06
| 03:19
| Joerg Arndt: Iva: please document change of offset in extensions line.
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#16 by Michel Marcus at Sun Mar 06 01:09:42 EST 2016
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#15 by Michel Marcus at Sun Mar 06 01:08:47 EST 2016
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| MATHEMATICA
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a[1]=1; a[n_]:=a[n]=(For[c=Sort[Table[a[k], {k, n-1}]]; d=Append[c, Last[c]+1]; m=First[Complement[Range[Last[d]], c]], MemberQ[c, m]||!PrimeQ[m*a[n-1]+1], m++ ]; m); Table[a[k], {k, 70}] (_}] (* _Farideh Firoozbakht_, Apr 14 2004) *)
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| STATUS
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proposed
editing
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Discussion
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| Sun Mar 06
| 01:09
| Michel Marcus: The formula looks like it is Mathematica code, which is already there. Ok to remove ?
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#14 by Ivan Neretin at Sat Mar 05 18:14:39 EST 2016
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#13 by Ivan Neretin at Sat Mar 05 18:13:51 EST 2016
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| OFFSET
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01,2
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| LINKS
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Ivan Neretin, <a href="/A073666/b073666.txt">Table of n, a(n) for n = 1..1000</a>
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| STATUS
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approved
editing
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Discussion
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| Sat Mar 05
| 18:14
| Ivan Neretin: Fixed the offset. Otherwise it was different from A081943 for no reason, and also contradicted A073667 (which is where a(n)=n: 1,2,3...).
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