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244 (number)

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244 (two hundred [and] forty-four) is the natural number following 243 and preceding 245.

← 243 244 245 →
Cardinaltwo hundred forty-four
Ordinal244th
(two hundred forty-fourth)
Factorization22 × 61
Primeno
Greek numeralΣΜΔ´
Roman numeralCCXLIV
Binary111101002
Ternary1000013
Senary10446
Octal3648
Duodecimal18412
HexadecimalF416

Additionally, 244 is:

  • the sum of two nonzero fifth powers (244 = 1 + 243 = 15 + 35).[1]
  • palindromic in bases 3 (1000013), 11 (20211), 60 (4460), 121 (22121), 243 (11243).
  • a Harshad number in bases 3, 9, 11, 61, 62, 81, 121, 122, 123 and 184.
  • the second anti-perfect number, meaning that reversing the digits of the proper divisors of 244 and adding the results gives 244 back again.[2]
  • part of the sequence 1, 2, 4, 8, 61, 221, 244, ... in which each number is formed by reversing the digits of the double of the previous number.[3]
  • the number of non-isomorphic set-systems of weight 8

References

[edit]
  1. ^ Sloane, N. J. A. (ed.). "Sequence A020896 (Positive numbers n such that n = x^5 + y^5 has a solution in nonzero integers x, y)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A072228 (Numbers n such that n = the sum of the reverses of the proper divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^ Sloane, N. J. A. (ed.). "Sequence A036447 (Double and reverse digits)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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