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Problems
| ID | Description / Title |
|---|---|
501 |
Eight Divisors |
502 |
Counting Castles |
503 |
Compromise or persist |
504 |
Square on the Inside |
505 |
Bidirectional Recurrence |
506 |
Clock sequence |
507 |
Shortest Lattice Vector |
508 |
Integers in base i-1 |
509 |
Divisor Nim |
510 |
Tangent Circles |
511 |
Sequences with nice divisibility properties |
512 |
Sums of totients of powers |
513 |
Integral median |
514 |
Geoboard Shapes |
515 |
Dissonant Numbers |
516 |
5-smooth totients |
517 |
A real recursion |
518 |
Prime triples and geometric sequences |
519 |
Tricolored Coin Fountains |
520 |
Simbers |
521 |
Smallest prime factor |
522 |
Hilbert's Blackout |