Properties of the Number 17421

Seventeen Thousand Four Hundred Twenty-One

Basics

Value: 17420 → 17421 → 17422

Parity: odd

Prime: No

Previous Prime: 17419

Next Prime: 17431

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5807

Divisors: 1, 3, 5807, 17421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100010000001101

Octal: 42015

Duodecimal: A0B9

Hexadecimal: 440d

Square: 303491241

Square Root: 131.988635874457

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

Numbers k such that 2^k + 15 is prime. A57197

Partial sums of the partition function (A000041), with the last term subtracted. Also the sum of the row of the character table for S_n corresponding to the partition n-1,1 for n>1. Also the sum over all partitions λ of n of one less than the number of 1's in λ. A58884

At stage 1, start with a unit equilateral equiangular triangle. At each successive stage add 3*(n-1) new triangles around outside with edge-to-edge contacts. Sequence gives number of triangles (regardless of size) at n-th stage. A64412

Number of partitions p of n such that median(p) < multiplicity(min(p)). A240212

Dying rabbits: a(0) = 1; for 1 <= n <= 12, a(n) = Fibonacci(n); for n >= 13, a(n) = a(n-1) + a(n-2) - a(n-13). A44

a(n) = 9·n² - 3. A157872

Pseudo-random numbers: MS C 6.0 version. A84275

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)*b(n-1), where a(0) = 3, a(1) = 4, b(0) = 1, b(1) = 2, and (a(n)) and (b(n)) are increasing complementary sequences. A296265

Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 2 ones in any 2 X 2 subblock. A141503

a(1) = 2; a(n) is twice the previous term if it is prime, otherwise the previous term minus its lowest prime factor plus one. A180625