[seqfan] Re: More fractal triangles (with primes)
Reinhard Zumkeller
reinhard.zumkeller at gmail.com
Tue Jan 13 22:09:30 CET 2015
. . . and https://oeis.org/A249900
:-) Best regards
Reinhard
2015-01-12 17:38 GMT+01:00 Eric Angelini <Eric.Angelini at kntv.be>:
> Hello SeqFans,
> Erase from T all pairs of integer [a(i), a(i+1)] that are prime
> or non-prime --like (2,3) or (4,6)-- and you'll get T back.
>
> T =
>
> 1,2,3,4,6,2,8,9,3,4,5,7,6,2,8,11,13,9,3,4,5,10,12,7,6,2,8,11,14,15,13,9,3,4,5,10,17,19,12,7,6,2,8,11,14,23,29,15,13,9,3,4,5,10,17,16,18,19,12,7,6,2,8,11,14,23,20,22,29,15,13,9,3,4,5,10,17,16,31,37,18,19,12,7,6,2,8,11,14,23,20,41,43,...
>
> The generating triangles [after a(1)=1] are:
>
> 1 2 3,4
> 6,2,8 9,3,4,5
> 7,6,2,8,11 13,9,3,4,5,10
> 12,7,6,2,8,11,14 15,13,9,3,4,5,10,17
> 19,12,7,6,2,8,11,14,23 29,15,13,9,3,4,5,10,17,16
> 18,19,12,7,6,2,8,11,14,23,20 22,29,15,13,9,3,4,5,10,17,16,31
> ... ...
>
> Read horizontally, line after line, to see T.
> Best,
> É.
>
>
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