Expansion of (1+x)^2/(1-x).
1, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
2 seqfan posts
Fri Sep 10 12:18:23 CEST 2010 [seqfan] Re: Chain of semiprimes: a(n)=least semiprime p*q such that a(n-1)=p+q.
Fri Sep 10 09:27:57 CEST 2010 [seqfan] Chain of semiprimes: a(n)=least semiprime p*q such that a(n-1)=p+q.
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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