🌳 Olivier Pirson — OPi 🇧🇪🇫🇷🇬🇧 🐧, 1975 –
Brussels, Belgium
Developer / MA Computer Science 👨💻 👨🔬
https://oeis.org/history?user=Olivier%20Pirson
"My" sequence:
My tiny contributions:
- A000217: Triangular numbers: a(n) = binomial(n+1,2) = n(n+1)/2 = 0 + 1 + 2 + ... + n
- A007527: Numbers that are not the sum of 4 hexagonal numbers
- A008794: Squares repeated
- A110660: Promic numbers repeated
- A111314: a(n) = a(n-1) + a(n-2) + 2 where a(0) = a(1) = 1