A106265: Any comments and suggestions
זקיר סעידוב - ד\"ר/Zakir Seidov Ph.D.
zakirs at yosh.ac.il
Thu Apr 28 19:44:51 CEST 2005
Dear SeqFans,
just submitted A106265 (see below).
My request to SEQGurus:
Are there missing numbers?
Is it known/correct/interesting...?
Thanks,
Zak
%I A106265
%S A106265 2,4,7,11,13,15,18,19,20,23,25,26,28,35,39,40,44,45,47,48,49,53,54,55,56,60
%N A106265 Numbers a such that equation Diophantine a+b^2=c^3 has integer solution(s) b and c.
%C A106265 Relative (minimal) values of b and c: A106266, A106267:
b=5,2,1,4,70,7,3,18,14,2,10,1,6,36,5,52,9,96,13,4,524,26,17,3,76,2
c=3,2,2,3,17,4,3, 7, 6,3, 5,3,4,11,4,14,5,21, 6,4, 65, 9, 7,4,18,4
Cf. A023055: (Apparently) differences between adjacent perfect powers
(integers of form a^b, a >= 1, b >= 2;
A076438: n which appear to have a unique representation as the difference
of two perfect powers; that is, there is only one solution
to Pillai's equation a^x - b^y = n, with a>0, b>0, x>1, y>1;
A076440: n which appear to have a unique representation as
the difference of two perfect powers and one of those powers is odd;
that is, there is only one solution to Pillai's equation a^x - b^y = n,
with a>0, b>0, x>1, y>1,
and that solution has odd x or odd y (or both odd);
A075772: Difference between n-th perfect power and the closest perfect power, etc.
%F A106265 A106265(n) = [A106267(n)]^3-[A106266(n)]^2
%Y A106265 A023055,A075772,A076438,A076440,A106266,A106267.
%O A106265 1
%K A106265 ,hard,more,nonn,unkn,
%A A106265 Zak Seidov (zakseidov at yahoo.com), Apr 28 2005
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