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 A051961 #22 Sep 14 2020 16:31:20
%S A051961 4,9,25,15,35,33,65,51,95,161,87,217,185,123,215,329,371,177,427,335,
%T A051961 213,511,395,581,1501,485,303,515,321,545,255,635,917,411,1529,447,
%U A051961 1057,1099,455,1169,1211,537,1991,573,965,591,435,2743,1115,681,665
%N A051961 Smallest number w such that A051953(w) = w - phi(w) is the n-th prime.
%H A051961 Amiram Eldar, <a href="/A051961/b051961.txt">Table of n, a(n) for n = 1..10000</a>
%F A051961 A050530(a(n)) = prime(n) and a(n) is the least number with this property.
%F A051961 a(n) = A063507(A000040(n)). - _Michel Marcus_, Feb 02 2015
%e A051961 The 31st term is 255 since 255 - phi(255) = 127, the 31st prime, and no number less than 255 has this property.
%t A051961 With[{c=Table[n-EulerPhi[n],{n,4000}]},Table[Position[c,p,1,1],{p,Prime[ Range[ 60]]}]]//Flatten (* _Harvey P. Dale_, Sep 14 2020 *)
%o A051961 (PARI) a(n) = {my(k = 1); while(k - eulerphi(k) != prime(n), k++); k;} \\ _Michel Marcus_, Feb 02 2015
%Y A051961 Cf. A050530, A051953.
%K A051961 nonn
%O A051961 1,1
%A A051961 _Labos Elemer_, Jan 05 2000