[seqfan] Non-primes and non-prime sums

Eric Angelini Eric.Angelini at kntv.be
Tue Jan 15 11:49:33 CET 2013


Hello Seq-Fans,

Write down the non prime numbers:

1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, ...

Insert between two non-primes the
smallest prime not yet present
in the sequence such that two
neighboring integers sum to a
non-prime.

I think the sequence starts:

1,5,4,2,6,43,8,7,9,11,10,23,12,13,14,31,15,17,16,...

Best,
É.

[many thanks to those who answered
the equivalent post, yesterday -- 
the seq has been kindly entered by 
Maximilian Hasler is here:
http://oeis.org/A209259]






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