qrpz

You wrote letters on the keyboard in tetrahedral sequence. This is 274th level of boredom.
First sequence is just ones :

1 1 1 1 1 1...
Second sequence is natural numbers :
1 2 3 4 5 6. You make next number by adding 1
Third sequence is triangular numbers :
1 3 6 10 15 21. You make nth number by adding n
Fourth sequence is tetrahedral numbers :

1 4 10 20 35 56. You make nth number by adding nth number from the previous sequence. Same for next sequences. And for previous.

You can find these sequences in Pascal's triangle and in (a+b) to the power of n.

"Qrpz is 1 4 10 20 coded into letters in qwerty sequence."

by mbxjsy October 7, 2025