### Properties of the number 318:

318 = 2 × 3 × 53 is a sphenic number and squarefree.318 has 3 distinct prime factors, 8 divisors, 9 antidivisors and 104 totatives.

318 has an oblong digit sum 12 in base 10.

Reversing the decimal digits of 318 results in a semiprime.

318 is the difference of 2 positive pentagonal numbers in 2 ways.

318 = 2

^{2}+ 5

^{2}+ 17

^{2}is the sum of 3 positive squares.

318

^{2}= 168

^{2}+ 270

^{2}is the sum of 2 positive squares in 1 way.

318

^{2}is the sum of 3 positive squares.

318 is a divisor of 107

^{2}- 1.

318 is palindromic in (at least) the following bases: 9, and 52.

318 in base 5 = 2233 and consists of only the digits '2' and '3'.

318 in base 7 = 633 and consists of only the digits '3' and '6'.

318 in base 9 = 383 and consists of only the digits '3' and '8'.

318 in base 12 = 226 and consists of only the digits '2' and '6'.

318 in base 17 = 11c and consists of only the digits '1' and 'c'.

### The number 318 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequences (among others):

Sequence numbers and descriptions below are taken from OEIS.A000112: Number of partially ordered sets ("posets") with n unlabeled elements.

A005277: Nontotients: even n such that phi(m) = n has no solution.

A006313: Numbers n such that n^16 + 1 is prime.

A007304: Sphenic numbers: products of 3 distinct primes.

A008458: Coordination sequence for hexagonal lattice.

A008588: Nonnegative multiples of 6.

A034296: Number of flat partitions of n: partitions {a_i} with each |a_i-a_{i-1}| <= 1.

A119679: a(n) = least k such that the remainder when 5^k is divided by k is n.

A191426: Dispersion of (3+[nr]), where r=(golden ratio)=(1+sqrt(5))/2 and [ ]=floor, by antidiagonals.

A214899: a(n) = a(n-1) + a(n-2) + a(n-3) with a(0)=2, a(1)=1, a(2)=2.

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