Properties of the Number 27025

Twenty-Seven Thousand Twenty-Five

Basics

Value: 27024 → 27025 → 27026

Parity: odd

Prime: No

Previous Prime: 27017

Next Prime: 27031

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 ² × 23 × 47

Divisors: 1, 5, 23, 25, 47, 115, 235, 575, 1081, 1175

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110100110010001

Octal: 64621

Duodecimal: 13781

Hexadecimal: 6991

Square: 730350625

Square Root: 164.39282222773596

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

First of two complementary trees generated by the triangular numbers. The second tree is A183232. A183231

a(n) = a(n-1) + 2·a(n-2) - a(n-3) - a(n-4) + 2·a(n-5) - 2·a(n-7) for n>7 and where a(0)=2, a(1)=3, a(2)=6, a(3)=10, a(4)=17, a(5)=29, a(6)=51. A285665

a(n) = ∑_i=1..n (A143293(n) mod prime(i))*A002110(i-1), where A002110 are the primorial numbers, and A143293 give their partial sums. A392863

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384689. A384690

Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,3 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. A155312

a(n) = T(n,n+3), T given by A027023. A27025