555

What would you like to do with 555? Here are a few quick options. Tell me which one you want, or ask something else.

• Math quick facts

  • Prime factorization: 555 = 3 × 5 × 37
  • Divisible by: 3, 5, 15
  • Binary: 1000101011
  • Hex: 0x22B
  • Roman numeral: DLV

• Quick practice problem set (5 questions)

  1. Factor 555 (done above, but you can show work)
  2. Compute 555 × 13
  3. Find 555 mod 7
  4. Convert 555 to Roman numerals (DLV)
  5. Is 555 a palindrome? (No)

• Electronics/CS: 555 timer IC basics

  • What a 555 timer does (oscillator, timer)
  • Differences between astable and monostable configurations

• Other context

  • 555 in pop culture (fake phone numbers)
  • 5/5 or other interpretations

If you pick one, I’ll tailor a concise explanation or a quick problem set.