Friday, March 1, 2019

Number of the day: 9010

Properties of the number 9010:

9010 = 2 × 5 × 17 × 53 is the 7890th composite number and is squarefree.
9010 has 4 distinct prime factors, 16 divisors, 11 antidivisors and 3328 totatives.
9010 has a semiprime digit sum 10 in base 10.
9010 has a triangular digit sum 10 in base 10.
9010 = 13 + 163 + 173 is the sum of 3 positive cubes in 1 way.
9010 = (76 × 77)/2 + … + (78 × 79)/2 is the sum of at least 2 consecutive triangular numbers in 1 way.
9010 is the difference of 2 positive pentagonal numbers in 2 ways.
9010 = 632 + 712 = 272 + 912 = 332 + 892 = 192 + 932 is the sum of 2 positive squares in 4 ways.
9010 = 332 + 392 + 802 is the sum of 3 positive squares.
90102 = 45102 + 78002 = 42402 + 79502 = 6002 + 89902 = 58742 + 68322 = 13782 + 89042 = 35342 + 82882 = 49142 + 75522 = 38162 + 81622 = 10722 + 89462 = 54062 + 72082 = 32642 + 83982 = 7822 + 89762 = 47602 + 76502 is the sum of 2 positive squares in 13 ways.
90102 is the sum of 3 positive squares.
9010 is a proper divisor of 18012 - 1.
9010 is palindromic in (at least) the following bases: 4, 16, 23, 30, 77, 91, -4, -13, -23, -26, -30, and -99.
9010 in base 13 = 4141 and consists of only the digits '1' and '4'.
9010 in base 16 = 2332 and consists of only the digits '2' and '3'.
9010 in base 23 = h0h and consists of only the digits '0' and 'h'.
9010 in base 24 = ffa and consists of only the digits 'a' and 'f'.
9010 in base 25 = eaa and consists of only the digits 'a' and 'e'.
9010 in base 29 = akk and consists of only the digits 'a' and 'k'.
9010 in base 30 = a0a and consists of only the digits '0' and 'a'.

The number 9010 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequences (among others):

Sequence numbers and descriptions below are taken from OEIS.
A032816: Numbers whose set of base 16 digits is {2,3}.
A051870: 18-gonal (or octadecagonal) numbers: a(n) = n*(8*n-7).
A068860: a(1) = 1; a(n+1) is the smallest number > a(n) which differs from it at every digit.
A116295: Numbers n such that n times n+2 gives the concatenation of two numbers m and m+1.
A116555: Anti-Harborth alternating chaotic sequence, 6th type.
A154379: a(n) = 250*n + 10.
A162254: a(n) = (2*n^3 + 5*n^2 + n)/2.
A202962: T(n,k)=Number of arrays of n+2 integers in -k..k with sum zero and adjacent elements differing in absolute value
A212105: Number of (w,x,y,z) with all terms in {1,...,n} and w > harmonic mean of {x,y,z}.
A281877: Numbers that are a primitive sum of two squares in more than 2 ways.

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