[seqfan] Re: Ersae a comma to produce a prime
DAN_CYN_J
dan_cyn_j at comcast.net
Mon Apr 8 21:40:22 CEST 2013
Hi Eric,
Does your sequence fail @ the 14th term which is 23?
Unless I am counting wrong, it removes the comma between [61,34]
Not a prime.
Dan
----- Original Message -----
From: "Eric Angelini" <Eric.Angelini at kntv.be>
To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
Sent: Monday, April 8, 2013 1:33:09 PM
Subject: [seqfan] Ersae a comma to produce a prime
Hello Seqfans,
If you concatenate the terms separated by the T-th comma in S,
you'll read a prime number.
T is any term of S and S doesn't show twice the same integer.
Hopefully S is also the lexicographically first such sequence:
S = 1,3,4,7,9,6,13,19,10,21,11,17,14,23,33,16,27,29,20,39,31,37,61,24,41,53,26,47,51,30,...
Example :
-- the first term is 1 ; so, if you erase the 1st comma in S
you'll read 13 -- which is a prime;
-- the second term is 3 ; so, if you erase the 3rd comma in S
you'll read 47 -- which is a prime;
-- the third term is 4 ; so, if you erase the 4th comma in S
you'll read 79 -- which is a prime;
-- the fourth term is 7 ; so, if you erase the 7th comma in S
you'll read 1319 -- which is a prime;
-- the fifth term is 9 ; so, if you erase the 9th comma in S
you'll read 1021 -- which is a prime;
...
Best,
É.
_______________________________________________
Seqfan Mailing list - http://list.seqfan.eu/
More information about the SeqFan
mailing list