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 A131826 a(n) is the unique solution to Cototient(x) = A131825(n). 7
 1, 4, 9, 25, 10, 26, 34, 38, 30, 52, 74, 76, 82, 122, 90, 134, 146, 148, 114, 130, 194, 202, 206, 170, 226, 244, 186, 268, 292, 228, 290, 386, 388, 398, 404, 412, 370, 482, 366, 488, 434, 514, 430, 584, 518, 578, 614, 626, 450, 674, 462, 580, 610, 746, 558, 772 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..15628 EXAMPLE a(5) = 10 is the unique solution to Cototient(x) = A131825(5) = 6. PROG (PARI) lista(nn) = {my(c, r, v=vector(nn^2+2, i, i - eulerphi(i))); for(k=0, nn, c=0; for(i=1, k*k+2, if(k==v[i], r=i; c++)); if(c==1, print1(r, ", "))); } \\ Jinyuan Wang, Mar 22 2020 CROSSREFS Cf. A051953, A063742, A131825. Sequence in context: A334656 A175121 A133905 * A366786 A051961 A339794 Adjacent sequences: A131823 A131824 A131825 * A131827 A131828 A131829 KEYWORD nonn AUTHOR Franz Vrabec, Jul 20 2007 EXTENSIONS More terms from Jinyuan Wang, Mar 22 2020 STATUS approved

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Last modified March 3 08:08 EST 2024. Contains 370499 sequences. (Running on oeis4.)