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 A378916 #40 Dec 20 2024 11:52:05 %S A378916 1,2,7,12,21,24,30,70,42,45,57,60,75,84,90,117,126,156,105,135,150, %T A378916 189,180,165,234,288,303,195,231,240,210,285,255,396,378,438,357,444, %U A378916 345,360,315,330,603,390,480,435,462,450,546,609,627,420,663,540,555,615 %N A378916 a(n) is the smallest positive integer having n decompositions of twice its value into sums of two noncomposite numbers. %C A378916 a(n) is the index of first n in A001031. %H A378916 David Consiglio, Jr., <a href="/A378916/b378916.txt">Table of n, a(n) for n = 1..200</a> %H A378916 David Consiglio, Jr., <a href="/A378916/a378916.py.txt">Python</a> %e A378916 For n = 3 we have that the first 3 in A001031 has index 7 and twice 7 is 14 and 14 has 3 decompositions into sums of two noncomposite numbers as follows: [1 + 13], [3 + 11], [7 + 7], so a(3) = 7. %Y A378916 Cf. A001031, A008578, A378917. %K A378916 nonn %O A378916 1,2 %A A378916 _Omar E. Pol_, Dec 12 2024 %E A378916 More terms from _David Consiglio, Jr._, Dec 18 2024