OFFSET
1,1
COMMENTS
This sequence is based on a problem proposed on the French math site Diophante.
Equivalently, numbers k such that A341281(k) = 0.
LINKS
Michel Marcus, Table of n, a(n) for n = 1..75
Diophante, A107, Binaire = décimal (in French).
EXAMPLE
The 3-digit number 110 is such that 110_10 = 1101110_2 and 110 is the smallest 3-digit number whose binary expansion's first three digits is equal to its decimal expansion, so 3 is not a term.
There is no 4-digit number m whose binary expansion's first 4 digits are the base-10 digits of m. Indeed, the 5-digit integer 10010_10 = 10011100011010_2 is the smallest integer whose binary and decimal expansions coincide through the first 4 digits (1001), but 10010 is not a 4-digit number, hence 4 is a term.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Bernard Schott, Feb 22 2021
EXTENSIONS
More terms from Michel Marcus, Feb 25 2021
STATUS
approved