A256352 - OEIS

%I #11 Apr 09 2024 15:58:23

%S 10,33,39,133,183,185,203,235,291,295,303,325,343,381,391,451,475,517,

%T 535,539,561,583,655,703,723,753,775,791,799,841,867,889,895,943,1003,

%U 1023,1083,1099,1121,1159,1165,1173,1186,1198,1207,1219,1263,1333,1366

%N Composites in base 10 that remain composite in exactly six bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.

%H Sebastian Petzelberger, <a href="/A256352/b256352.txt">Table of n, a(n) for n = 1..10000</a>

%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_024.htm">PP&P Puzzle 24: Primes in several bases</a>

%Y Cf. A052026, A256350-A256356, A038537, A052027-A052033, A084482, A236356.

%K nonn,base

%O 1,1

%A _Sebastian Petzelberger_, Mar 25 2015