Properties of the Number 249

Two Hundred Forty-Nine

Basics

Value: 248 → 249 → 250

Parity: odd

Prime: No

Previous Prime: 241

Next Prime: 251

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 83

Divisors: 1, 3, 83, 249

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 11111001

Octal: 371

Duodecimal: 189

Hexadecimal: f9

Square: 62001

Square Root: 15.7797338380595

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

a(n) = ∑_k=1..n floor(n/k); also ∑_k=1..n d(k), where d = number of divisors (A000005); also number of solutions to x·y = z with 1 <= x,y,z <= n. A6218

Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity). A46315

Numbers having only prime factors of form prime(prime); a(1)=1. A76610

Positive integers having distinct base-2 run lengths. A44813

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w² + x·y = 0. A211422

a(n) = 6·n+3. A16945

Odd numbers of the form p·q where p and q are distinct primes. A46388

Number of partitions of n into parts 8k or 8k+1. A35441

Partial sums of A002110, the primorial numbers. A143293

Total number of odd entries in first n rows of Pascal's triangle: a(0) = 0, a(1) = 1, a(2k) = 3·a(k), a(2k+1) = 2·a(k) + a(k+1). a(n) = ∑_i=0..n-1 2^wt(i). A6046