|
%I #11 Aug 22 2021 15:40:40
%S 11,14,27,30,43,56,62,75,78,91,94,107,120,126,139,142,155,158,171,203,
%T 206,219,222,224,248,254,267,270,283,286,299,312,318,331,334,347,350,
%U 363,376,382,395,398,411,414,427,459,462,475
%N Numbers k such that 2 and 3 occur juxtaposed in the base-4 representation of k but not of k-1.
%t Select[Range[500],MemberQ[Sort/@Partition[IntegerDigits[#,4],2,1], {2,3}]&&!MemberQ[Sort/@Partition[IntegerDigits[#-1,4],2,1], {2,3}]&] (* _Harvey P. Dale_, Apr 21 2011 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
|
