A044023 - OEIS

%I #9 Aug 29 2021 01:54:46

%S 37,73,137,173,237,273,337,379,437,473,537,573,637,673,739,773,837,

%T 873,937,973,1037,1073,1137,1173,1237,1273,1337,1379,1437,1473,1537,

%U 1573,1637,1673,1739,1773,1837,1873,1937,1973,2037

%N Numbers k such that 3 and 7 occur juxtaposed in the base-10 representation of k but not of k+1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_