Numbers k such that sigma(k-3) + sigma(k+3) = sigma(2*k).

Terms

a(0) =5a(1) =63a(2) =99a(3) =279a(4) =355a(5) =551a(6) =561a(7) =639a(8) =1359a(9) =1915a(10) =2151a(11) =2799a(12) =4311a(13) =8199a(14) =8919a(15) =10915a(16) =12591a(17) =13239a(18) =16265a(19) =16911a(20) =17991a(21) =18999a(22) =20799a(23) =24039a(24) =24471a(25) =28071a(26) =28719a(27) =30519a(28) =33039a(29) =35271