Numbers k such that k and k+1 have the same denominator of the harmonic means of their divisors.

Terms

a(0) =12a(1) =88a(2) =180a(3) =266a(4) =321a(5) =604a(6) =4277a(7) =4364a(8) =8632a(9) =15861a(10) =18720a(11) =28461a(12) =47613a(13) =63546a(14) =97412a(15) =98907a(16) =135078a(17) =137333a(18) =154132a(19) =179621a(20) =185776a(21) =192699a(22) =203709a(23) =265489a(24) =284883a(25) =344217a(26) =383466a(27) =517610a(28) =604197a(29) =876469