Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both semiprime.

Terms

a(0) =80a(1) =440a(2) =735a(3) =1014a(4) =1160a(5) =1274a(6) =1547a(7) =2023a(8) =2820a(9) =4806a(10) =5490a(11) =5565a(12) =5875a(13) =6137a(14) =7215a(15) =7748a(16) =10309a(17) =10520a(18) =12104a(19) =12255a(20) =12256a(21) =12257a(22) =12614a(23) =13112a(24) =13481a(25) =14120a(26) =14415a(27) =14705a(28) =14927a(29) =15317