511 (number)

Template:More citations needed Template:Infobox number 511 is the natural number following 510 and preceding 512.

It is a Mersenne number, being one less than a power of 2: $511=2^9-1$. As a result, 511 is a palindromic number and a repdigit in bases 2 (111111111₂). It is also palindromic and a repdigit in base 8 (777₈).

It is a generalized heptagonal number Template:OEIS, since $511=\frac{1}{2}(5n^2-3n)$ when $n=-14$.

It is a Harshad number in bases 3, 5, 7, 10, 13 and 15.

Special use in computers

The octal representation of 511 (777₈) is commonly used by Unix commands to specify a custom record separator in order to "slurp" input as a whole, rather than line-by-line (i.e. separated at newline characters).

References

Template:Num-stub