login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Composites n with identical largest digits of n and n-th prime.
1

%I #4 Mar 30 2012 18:52:32

%S 14,30,32,54,56,74,92,94,95,116,138,148,159,169,189,196,208,209,213,

%T 217,224,245,247,249,261,270,272,273,275,280,282,284,285,286,287,288,

%U 289,290,291,292,294,295,296,297,298,299,309,321,324,325,326,330,334,335

%N Composites n with identical largest digits of n and n-th prime.

%e If n=14=composite and 43=prime(14), then 1<4=4>3 and 14=a(1). If n=30=composite and 113=prime(30), then 0<3=3>1=1 and 30=a(2). If n=32=composite and 131=prime(32), then 2<3=3>1=1 and 32=a(3), etc.

%Y Cf. A000027, A000040.

%K nonn,base

%O 1,1

%A _Juri-Stepan Gerasimov_, Jan 23 2009

%E Corrected (190 replaced by 290) by _R. J. Mathar_, May 10 2010