267
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Number
$267$ (two hundred and sixty-seven) is:
- $3 \times 89$
- The $50$th lucky number:
- $1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $219$, $223$, $231$, $235$, $237$, $241$, $259$, $261$, $267$, $\ldots$
- The $1$st term of the smallest triplet of integers in arithmetic sequence which have the same divisor sum:
- $\map {\sigma_1} {267} = \map {\sigma_1} {295} = \map {\sigma_1} {323} = 360$
- The length of the longest face diagonal of the smallest cuboid whose edges and the diagonals of whose faces are all integers:
Also see
Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $267$