[seqfan] Re: A073615

Don Reble djr at nk.ca
Thu Feb 6 13:45:59 CET 2014


> [A073615] could use some more terms (probably from a trivial 
> modification of your program, Don?)...

    Ok.

    5,11,13,101,223,1277,1279,1616603,3772637849,51448351,
    115438255651987,1007002660975121,433241801791933


    Everything looks good in those two sequences, except maybe

> %t A236411 This program generates the first ten terms of the sequence.
>    To generate more would require significantly greater computing
>    resources...

    All you need is a sieving technique. BitTwiddler, here, is an
    ordinary desk computer. But the sieve hastens by a factor of 140000,
    and he pops out that that eleventh term (a(12), actually) in
    1.6 seconds.

-- 
Don Reble  djr at nk.ca



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