[seqfan] Re: Sophie Germen nonprimes

[Maximilian Hasler]

In the spirit of complete negation, d(n) could also be replaced by the
number of anti-divisors (A066272), thus
4,6,8,9,10,14,18,20,26,32,34,36,42,54,62,66,72,80,81,84,86,88,92,96,...

but logically, "is prime" should also be replaced by "is not prime",
don't you think?
So, as usual, there are ambiguities and many interpretations /
variants possible when "prime" is replaced by "non-prime".

PS: "Germain" should also be corrected, but when I do it in the title,
some popular mailing software will not recognize that this is still
the same thread.

Maximilian


On Tue, Jan 15, 2013 at 7:32 AM, юрий герасимов <2stepan at rambler.ru> wrote:
>
> Dear SegFans, Right or wrong call sequence as Sophie Germen nonprimes n such
> that d(n)*n + 1 is prime  (d = A000005 and d(n)*n = A038040(n)) : 1, 4, 10,
> 12, 15, 18, 22, 24, 27, 30, 32, 34, 39, 42, 45, 52, 54, 56, 57, 58, 63, 64,
> 68, 69, 76, 84, 87,...
> Tranks, Juri-Stepan Gerasimov.
>
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