[seqfan] Primes, concats and videotapes
Eric Angelini
Eric.Angelini at kntv.be
Tue Nov 23 12:44:29 CET 2010
[This message of mine never appeared on SeqFans,
here is a duplicate]
-----Message d'origine-----
De : Eric Angelini
Envoyé : lundi 22 novembre 2010 16:08
À : 'Seqfan Mailing List'
Objet : Primes, concats and videotapes
Hello SeqFans,
Three thingies:
Let:
a(1) = 1
a = a(n)
b = a(n+1)
b>a
d = b-a
[t,u,...,z] = the concatenation of the strings
't' and 'u' and ... and 'z'
Now build S(1) where b is the smallest integer such
that [a,d] is prime
... build S(2) where b is the smallest integer such
that [d,b] is prime
... build S(3) where b is the smallest integer such
that [a,d,b] is prime
Are the herunder starts correct?
S(1) = 1, 2, 5, 8, 11, 14, 23, 26, 29, 32, 49, ...
d = 1 3 3 3 3 9 3 3 3 17
p = 11,23,53,83,113,149,233,263,293,3217,
S(2) = 1, 3, 7, 9, 11, 17, 21, 23, 33, 47, 53, ...
d = 2 4 2 2 6 4 2 10 14 6
p = 23,47,29,211,617,421,223,1033,1447,653,
S(3) = 1, 7, 11, 13, 17, 23, 29, 31, 41, ...
d = 6 4 2 4 6 6 2 10
p = 167,7411,11213,13417,17623,23629,29231,311041,
Best,
É.
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