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%I #12 Aug 23 2021 01:06:12
%S 39,60,103,124,167,188,231,252,295,312,359,380,423,444,480,508,551,
%T 572,615,636,679,700,743,764,807,824,871,892,935,956,992,1020,1063,
%U 1084,1127,1148,1191,1212,1255,1276,1319,1336,1383
%N Numbers k such that 4 and 7 occur juxtaposed in the base-8 representation of k but not of k-1.
%t Select[Range[1500],MemberQ[Sort/@Partition[IntegerDigits[#,8],2,1],{4,7}]&&!MemberQ[Sort/@Partition[IntegerDigits[#-1,8],2,1],{4,7}]&] (* _Harvey P. Dale_, Oct 20 2011 *)
%Y Cf. A007094.
%K nonn,base
%O 1,1
%A _Clark Kimberling_