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 A090788 #14 Nov 07 2018 02:34:10 %S A090788 72,360,432,528,768,888,960,1032,1080,1128,1272,1392,1488,1512,1608, %T A090788 1632,1728,1920,2088,2112,2232,2352,2400,2448,2568,2688,2808,3048, %U A090788 3168,3240,3288,3480,3648,3768,4008,4032,4128,4248,4272,4392,4488,4512,4992 %N A090788 Numbers that can be expressed as the difference of the squares of primes in just two distinct ways. %e A090788 72 = 11^2 - 7^2 = 19^2 - 17^2. %o A090788 (PARI) i=4; while(i<=5000, k=0; m=2; while(m*m<=i, if(i%(2*m)==0, a=(i/m-m)/2; b=a+m; if(isprime(a)&&isprime(b), k+=1)); m+=2); if(k==2, print1(i, ", ")); i+=4) \\ _Antonio Roldán_, Nov 06 2018 %Y A090788 Cf. A078667, A090781, A090782. %K A090788 nonn %O A090788 1,1 %A A090788 _Ray Chandler_, Feb 14 2004