[seqfan] Re: Non primes and non prime remainders
Vladimir Shevelev
shevelev at bgu.ac.il
Sun Oct 5 14:45:47 CEST 2014
Beginning with the second term, if a(n)+1 is prime, then a(n+1)=a(n)+4,
otherwise, a(n+1)=a(n)+1.
Regards,
Vladimir
________________________________________
From: SeqFan [seqfan-bounces at list.seqfan.eu] on behalf of Eric Angelini [Eric.Angelini at kntv.be]
Sent: 05 October 2014 12:34
To: Sequence Discussion list
Subject: [seqfan] Non primes and non prime remainders
Hello SeqFans,
C is the "sister" sequence of the previous one.
C starts with c(1)=1 and is always extended
with the smallest non prime c(n) such that
c(n)/c(n-1) has a non prime remainder.
We get (if I'm not wrong):
C=1,4,8,9,10,14,15,16,20,21,22,26,27,28,32,33,34,35,36,40,...
Best,
É.
[if of interest, the "panaché" sequences could be computed and added
to the OEIS too:
C' starts with 1 and C' is extended with the
smallest non prime c'(n) such that c'(n)/c'(n-1)
has a prime remainder;
P' starts with 2 and P' is extended with the
smallest prime p'(n) such that p'(n)/p'(n-1)
has a non prime remainder.]
Best,
É.
Catapulté de mon aPhone
_______________________________________________
Seqfan Mailing list - http://list.seqfan.eu/
More information about the SeqFan
mailing list