Thursday, August 3, 2017

Number of the day: 960

Properties of the number 960:

960 = 26 × 3 × 5 is the 797th composite number and is not squarefree.
960 has 3 distinct prime factors, 28 divisors, 7 antidivisors and 256 totatives.
960 has an emirpimes digit sum 15 in base 10.
960 has a triangular digit sum 15 in base 10.
960 = 62 + … + 142 is the sum of at least 2 consecutive positive squares in 1 way.
960 is the difference of 2 nonnegative squares in 10 ways.
960 is the difference of 2 positive pentagonal numbers in 1 way.
960 is not the sum of 3 positive squares.
9602 = 5762 + 7682 is the sum of 2 positive squares in 1 way.
9602 is the sum of 3 positive squares.
960 is a proper divisor of 312 - 1.
960 is palindromic in (at least) the following bases: 31, 39, 47, 59, 63, 79, and 95.
960 in base 4 = 33000 and consists of only the digits '0' and '3'.
960 in base 15 = 440 and consists of only the digits '0' and '4'.

The number 960 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequences (among others):

Sequence numbers and descriptions below are taken from OEIS.
A000118: Number of ways of writing n as a sum of 4 squares; also theta series of lattice Z^4.
A002093: Highly abundant numbers: numbers n such that sigma(n) > sigma(m) for all m < n.
A002417: 4-dimensional figurate numbers: a(n) = n*binomial(n+2, 3).
A005179: Smallest number with exactly n divisors.
A005563: a(n) = n*(n+2) (or, (n+1)^2 - 1).
A025487: List giving least integer of each prime signature; also products of primorial numbers A002110.
A029470: Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 25 (most significant digit on left).
A033996: 8 times triangular numbers: a(n) = 4n(n+1).
A051682: 11-gonal (or hendecagonal) numbers: a(n) = n*(9*n-7)/2.
A075928: List of codewords in binary lexicode with Hamming distance 4 written as decimal numbers.

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