cp's OEIS Frontend

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.

A352231 Numbers that can be expressed as the sum of two primes in exactly 9 ways.

This page as a plain text file.
%I A352231 #13 Mar 10 2022 10:27:55
%S A352231 90,132,170,196,202,220,230,236,238,244,250,254,262,268,302,314,338,
%T A352231 346,356,388,428,458,488
%N A352231 Numbers that can be expressed as the sum of two primes in exactly 9 ways.
%F A352231 A061358(a(n)) = 9. - _Alois P. Heinz_, Mar 08 2022
%e A352231 90 = 7+83 = 11+79 = 17+73 = 19+71 = 23+67 = 29+61 = 31+59 = 37+53 = 43+47.
%t A352231 c[n_] := Count[IntegerPartitions[n, {2}], _?(And @@ PrimeQ[#] &)]; Select[Range[1000], c[#] == 9 &] (* _Amiram Eldar_, Mar 08 2022 *)
%Y A352231 Numbers that can be expressed as the sum of two primes in k ways for k=0..10: A014092 (k=0), A067187 (k=1), A067188 (k=2), A067189 (k=3), A067190 (k=4), A067191 (k=5), A066722 (k=6), A352229 (k=7), A352230 (k=8), this sequence (k=9), A352233 (k=10).
%Y A352231 Cf. A000954, A023036, A061358.
%K A352231 nonn,more
%O A352231 1,1
%A A352231 _Wesley Ivan Hurt_, Mar 08 2022