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Numbers (written in decimal) which appear the same when written in base 5 and base 10/2.
2

%I #2 Mar 30 2012 18:51:29

%S 0,1,2,3,4,10,11,12,13,14,20,21,22,23,24,50,51,52,53,54,60,61,62,63,

%T 64,70,71,72,73,74,100,101,102,103,104,110,111,112,113,114,120,121,

%U 122,123,124,250,251,252,253,254,260,261,262,263,264,270,271,272,273,274

%N Numbers (written in decimal) which appear the same when written in base 5 and base 10/2.

%C To represent a number in base b, if a digit exceeds b, subtract b and carry 1. In fractional base b/c, subtract b and carry c. The sequence consists of numbers which in base 5 only have even digits, or one more than such numbers.

%e 10 appears since it is written as 20 both in base 5 and base 10/2. 40 does not since it is written as 130 in base 5 and 80 in base 10/2.

%Y Cf. A007091, A024657, A058186.

%K base,nonn

%O 0,3

%A _Henry Bottomley_, Nov 17 2000