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Lucas numbers

The Ghalimi scale is made of many prime numbers:

  • 147 is prime
  • 2 — 76
  • 3 — 123
  • 4199 is prime
  • 5 — 322
  • 6521 is prime
  • 7 — 843
  • 8 — 1,364
  • 92,207 is prime
  • 10 — 3,571 is prime

5 out of 10 is quite unusual, and this was first recognized by French mathematician François Édouard Anatole Lucas, who called these numbers Lucas primes. In fact, the numbers of the Ghalimi scale are nothing more than the Lucas numbers, starting with 47.

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