login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Lesser of a,b where n^2 = a^3 + b^3; a,b > 0 and gcd(a,b)=1. The greater of a,b is the corresponding term in A099533 and n, which is used to order this sequence, is the corresponding term in A099426.
3

%I #14 Oct 19 2019 03:20:24

%S 1,11,56,57,217,242,305,851,23,122,592,1706,1376,1001,2257,1960,193,

%T 781,889,1729,3071,2920,5896,1346,2137,2184,1633,8313,7034,1953,7379,

%U 9097,6104,10712,4097,12369,7082,12265,13441,15709,18314,5833,8792,8929,3641

%N Lesser of a,b where n^2 = a^3 + b^3; a,b > 0 and gcd(a,b)=1. The greater of a,b is the corresponding term in A099533 and n, which is used to order this sequence, is the corresponding term in A099426.

%H Donovan Johnson, <a href="/A099532/b099532.txt">Table of n, a(n) for n = 1..300</a>

%e a(2) is 11 because term A099426(2) is 228, 228^2 = 11^3 + 37^3 and 11 < 37.

%o (PARI) for(s=2,1e5,for(x=1,s\2,my(y=s-x);if(gcd(x,y)>1,next); if(issquare(x^3+y^3), print1(x", ")))) \\ _Charles R Greathouse IV_, Nov 06 2014

%Y Cf. A099426, A099533.

%K nonn

%O 1,2

%A _Hans Havermann_, Oct 20 2004