Numbers k such that sopf(k) = sopf(k^2 - 1), where sopf(k) = A008472(k).

Terms

a(0) =1a(1) =5a(2) =51a(3) =99a(4) =155a(5) =209a(6) =2369a(7) =2569a(8) =2882a(9) =5745a(10) =15143a(11) =21691a(12) =34573a(13) =36566a(14) =40516a(15) =41237a(16) =65304a(17) =82718a(18) =101638a(19) =112305a(20) =185701a(21) =238302a(22) =247221a(23) =254865a(24) =291399a(25) =439104a(26) =445794a(27) =483107a(28) =532645a(29) =538531