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Problems

Number theory
Difficulty
Sort by
1156
Fermat vs. Pythagoras
Easy
1158
The Luckiest number
Hard
1182
Simple division
1220
Geek Challenge [SKRZAT] (Base Minus Two)
1229
GCD Extreme II
Very easy
1230
GCD Super-Extreme
Easy
1243
Least Common Multiple
Very easy
1244
GCD and LCM
Very easy
1245
Island of Misfortune
Medium
1246
Minimum Sum LCM
Medium
1247
LCM Cardinality
Very easy
1261
Football Achievements
Hard
1273
Not so Flat After All
1355
Number of N-digit numbers containing the digit 7
Very easy
1367
Sky Code
Very easy
1373
GCD Determinant
Easy
1375
Base -2
Very easy
1376
The Bases Are Loaded
Easy
1377
What Base Is This?
Medium
1378
Fibonaccimal Base
Very easy
1408
Bananas
Hard
1414
Pebbles
Very easy
1441
Decomposition of a Number
Easy
1487
Bacteria
Hard
1561
RSA Attack
Very easy
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