A072511 & A121516

[David Wilson]

Yeah, they are effectively the same. The latter description seems better.

----- Original Message ----- 
From: "zak seidov" <zakseidov at yahoo.com>
To: <seqfan at ext.jussieu.fr>
Sent: Sunday, September 10, 2006 12:43 PM
Subject: A072511 & A121516


> Seqfans,
> 
> Except for the first term in A072511,
> are A121516 = A072511?
> Thanks, Zak
> 
> %I A072511
> %S A072511
> 1,4,8,12,18,24,30,39,42,45,57,72,60,84,90,117,123,
> %N A072511 Let f(x) = A061357(x) be the number of
> primes p < x such that 2x-p is also prime. 
>               a(n) is the smallest positive integer x
> such that f(x) = n.
> 
> %I A121516
> %S A121516
> 4,8,12,18,24,30,39,42,45,57,72,60,84,90,117,123,
> %N A121516 Least number m such that 2m can be
> expressed as the sum of two distinct primes by 
>               exactly n ways.
> 
> 
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