Hydrophilic-lipophilic balance

Template:Infobox number 252 (two hundred fifty two) is the natural number following 251 and preceding 253.

252 is the central binomial coefficient ${\tbinom {10}{5}}$, and is $\tau (3)$, where $\tau$ is the Ramanujan tau function. 252 is also $\sigma _{3}(6)$, where $\sigma _{3}$ is the function that sums the cubes of the divisors of its argument::

$1^{3}+2^{3}+3^{3}+6^{3}=(1^{3}+2^{3})(1^{3}+3^{3})=252.$

It is a practical number, and a hexagonal pyramidal number. There are 252 points on the surface of a cuboctahedron of radius five in the fcc lattice, 252 ways of writing the number 4 as a sum of six squares of integers, 252 ways of choosing four squares from a 4×4 chessboard up to reflections and rotations, and 252 ways of placing four pieces on a Connect Four board.

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

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