Properties of the Number 79

Seventy-Nine

Basics

Value: 78 → 79 → 80

Parity: odd

Prime: Yes

Previous Prime: 73

Next Prime: 83

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 79

Divisors: 1, 79

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001111

Octal: 117

Duodecimal: 67

Hexadecimal: 4f

Square: 6241

Square Root: 8.888194417315589

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

The prime numbers. A40

Squarefree numbers: numbers that are not divisible by a square greater than 1. A5117

The odd numbers: a(n) = 2·n + 1. A5408

Gpf(n): greatest prime dividing n, for n >= 2; a(1)=1. A6530

Powers of primes. Alternatively, 1 and the prime powers (p^k, p prime, k >= 1). A961

Lpf(n): least prime dividing n (when n > 1); a(1) = 1. Or, smallest prime factor of n, or smallest prime divisor of n. A20639

Prime numbers at the beginning of the 20th century (today 1 is no longer regarded as a prime). A8578

Primes of the form x² + xy + 2y², with·and y nonnegative. A106856

Toothpick sequence (see Comments lines for definition). A139250

Central polygonal numbers (the Lazy Caterer's sequence): n(n+1)/2 + 1; or, maximal number of pieces formed when slicing a pancake with n cuts. A124

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