A026467|A113626

Eric moongerms at wanadoo.fr
Sat Apr 19 00:34:03 CEST 2008


can i say that these two sequences are linked?
A026467  a(n) = least positive integer > a(n-1) and not a(i)^2 + a(j)^2 for
1<=i<j<=n.
and
A113626  Numbers simultaneously heptagon-free, pentagon-free, squarefree,
and triangle-free.


for
7,8,11,12,15,17,19
we have A112929  a(n) = order of n-th term of A112925 among squarefree
integers.
and
A111105  Number of squarefree integers not exceeding the n-th prime.
(without crossref write in database between the two sequences)

------------------------------
if i take
A080686
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,22,23,24,25,26,27,2
7,28,28,29,30,31,32,33,33,34,35,36,36,37,37,38,39,39,39,40,41,42,43,44,44,45
,46,47,48,48,48,49,49,49,50,51,52,53,53,54,54,55,55,56
minus
A047332
0,2,3,5,6,7,9,10,12,13,14,16,17,19,20,21,23,24,26,27,28,30,31,33,34,35,37,38
,40,41,42,44,45,47,48,49,51,52,54,55,56,58,59,61,62,63,65,66,68,69,70,72,73,
75,76,77,79

i have
-1,0,0,1,1,1,2,2,3,3,3,4,4,5,5,5,6,6,7,7,7,8,9,10,10,10,11,11,13,13,14,15,15
,16,16,16,18,18,19,19,20,21,22,23,23,24,26,26,27,27,27,28,29,30,30,30,31
which is funny linked to A085269  Integer part of the conversion from
centimeters to inches,







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