[seqfan] Re: More fractal triangles (with primes)

[Reinhard Zumkeller]

. . .  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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