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%I #6 Jul 27 2019 10:07:35
%S 4,22,41,104,114,124,134,144,154,164,174,184,194,204,212,221,249,304,
%T 404,411,429,504,604,624,704,804,904,1022,1041,1122,1141,1222,1241,
%U 1322,1341,1422,1441,1522,1541,1622,1641,1722,1741,1822,1841,1922,1941,2022
%N Numbers which converge to 4 under repeated application of the powertrain map of A133500.
%e 249 -> 2^4*9 = 144 -> 1^4*4 = 4.
%Y Cf. A133500, A133501, A135384, A135385, A309385, A326733, A326734, A326735, A326736, A326738, A326739, A326740, A326741, A326742.
%K nonn,base,easy
%O 1,1
%A _Martin Renner_, Jul 22 2019