This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A332573 #7 Feb 17 2020 09:36:01 %S A332573 7,16,127,128,151,248,256,343,472,536,568,631,632,751,752,823,856,943, %T A332573 1048,1111,1136,1207,1303,1327,1328,1336,1432,1527,1528,1591,1687, %U A332573 1688,1711,1712,1783,1816,1912,2031,2032,2047,2048,2103,2167,2263,2416,2487,2488 %N A332573 Numbers k such that k and k + 1 are both norm-deficient in Gaussian integers (A332572). %H A332573 Amiram Eldar, <a href="/A332573/b332573.txt">Table of n, a(n) for n = 1..10000</a> %e A332573 7 is a term since both 7 and 7 + 1 = 8 are norm-deficient in Gaussian integers (A332572). %t A332573 normDefQ[z_] := Abs[DivisorSigma[1, z, GaussianIntegers -> True]]^2 < 2*Abs[z]^2; Select[Range[2500], normDefQ[#] && normDefQ[# + 1] &] %Y A332573 Cf. A005100, A103228, A103229, A103230, A317047, A332572. %K A332573 nonn %O A332573 1,1 %A A332573 _Amiram Eldar_, Feb 16 2020