Frank M Jackson
unread,Jun 7, 2026, 9:41:56 AMJun 7Sign in to reply to author
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The b-file for A143512 contains errors. All terms should be odd but at
line 3735 there is an even term. Thereafter another 5048 even terms can
be found. I suspect, that for the larger terms, the generating program
was susceptible to rounding-up/accuracy errors.
Can someone correct the accuracy issue and generate a corrected 10000
term b-file?
Also the b-file for A143513 has similar problems.
Kind regards
Frank Jackson
PS. I have used the following Mma program for A143512. It is slow and
only generates 763 terms.
fnum = Times @@ {3, 5, 17, 257, 65537};
fQ[n_] := PowerMod[fnum, n, n] === 0;
Table[If [fQ[n], n, Nothing], {n, 1, 10^9}]
(*using _Bruno Berselli_ program in A003593*)