Build a number right-to-left. At each step, the path turns: 6 turns left, 7 turns right. Adjust the angle to see different "coastline" shapes — each power of 2 has a unique signature.
60°
Current Number
N (built right-to-left)
Press 6 to begin
Step 0 of 67
Arithmetic Check
Why the next digit?
Step 1: First digit must be 6
6 mod 2 = 0 ✓ (divisible)
7 mod 2 = 1 ✗ (not divisible)
→ Press 6
Progress
Begin with 6 — the only single digit in {6,7} divisible by 2.
The path will grow as you add digits. Adjust the angle to reshape the curve.
0 sixes (left)
0 sevens (right)