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 A090785 #8 May 16 2021 08:04:01 %S A090785 5,16,24,48,240,288,360,432,648,672,720,840,888,960,1080,1128,1248, %T A090785 1320,1392,1488,1560,1608,1680,1728,1800,1920,2040,2088,2112,2232, %U A090785 2280,2400,2520,2568,2640,2808,2832,2880,3120,3240,3312,3360,3432,3672,3912,4080 %N A090785 Numbers that can be expressed as the difference of the squares of consecutive primes in just one way. %e A090785 5 = 3^2 - 2^2. %o A090785 (Python) %o A090785 from sympy import primerange %o A090785 from collections import Counter %o A090785 def aupto(limit): %o A090785 sqps = [p*p for p in primerange(1, limit//2+1)] %o A090785 ways = Counter(sqps[i+1]-sqps[i] for i in range(len(sqps)-1)) %o A090785 return sorted(k for k in ways if k <= limit and ways[k] == 1) %o A090785 print(aupto(4080)) # _Michael S. Branicky_, May 16 2021 %Y A090785 Cf. A078667, A090781, A090783, A090784, A091878. %K A090785 nonn %O A090785 1,1 %A A090785 _Ray G. Opao_, Feb 08 2004 %E A090785 More terms from _Ray Chandler_, Feb 11 2004