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%I #8 Aug 22 2021 16:13:34
%S 9,21,34,45,59,71,84,96,105,121,134,146,159,170,184,196,209,221,225,
%T 259,271,284,295,309,321,334,346,355,371,384,396,409,420,434,446,459,
%U 471,480,496,509,521,525,559,571,584,596,605,621
%N Numbers k such that 1 and 4 occur juxtaposed in the base-5 representation of k but not of k-1.
%Y Cf. A007091.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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