[seqfan] Re: numbers that can be represented as 2*p +2*q, where p and q are prime.

юрий герасимов 2stepan at rambler.ru
Wed Dec 12 05:52:56 CET 2012


Dear Segfans.

If these (A079026 and A219955) sequences are suitable for OEIS, mayble will be useful other sequences, as:

1) Numbers that can be represented as x*y/2, where x + y and x - y are prime:   2, 3, 5, 6, 9, 12, 14, 15, 18, 20, 21, 24, 30, 33, 35, 36,..?   =    A124866 Numbers of the form (p^2 - q^2)/8, p, q odd primes, p>q ?

or

2) A_______Numbers that cannot be represented as x*y/2, where x + y and x - y are prime :   1, 4, 7, 8, 10, 11, 13, 16, 17, 19, 22, 23, 25, 26, 27, 28, 29, 31, 32, 34, 37,..?

Regards,
Juri-Stepan Gerasimov.  


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