Project Euler and ProjectEuler+ on HackerRank

#	Name	Python	C	Notes
1	Multiples of 3 or 5	✓	✓	1 2
2	Even Fibonacci Numbers	✓	✓	1 3
3	Largest Prime Factor	✓		1 3
4	Largest Palindrome Product	✓	✓	1 3
5	Smallest Multiple	✓	✓	1 3
6	Sum Square Difference	✓		1 3
7	10001st Prime	✓	✓	1 3
8	Largest Product in a Series	✓		1 3
9	Special Pythagorean Triplet	✓	✓	1 3
10	Summation of Primes	✓		1 3
11	Largest Product in a Grid	✓		1 3
12	Highly Divisible Triangular Number	✓		1 3
13	Large Sum	✓		1 3
14	Longest Collatz Sequence	✓		1 3
15	Lattice Paths	✓		4 3
16	Power Digit Sum	✓		1 3
17	Number Letter Counts	✓		4 5
18	Maximum Path Sum I	✓		1 3
19	Counting Sundays	✓		1
20	Factorial Digit Sum	✓		1 3
67	Maximum Path Sum II	✓		6 3
69	Totient Maximum	✓		4 3
92	Square Digit Chains	✓		4 3
218	Perfect Right-angled Triangles	✗	✗	7 3
317	Firecracker	✓		8
457	A Polynomial Modulo the Square of a Prime			8
487	Sums of Power Sums			8
499	St. Petersburg Lottery	✓		8
506	Clock Sequence	✓		8
684	Inverse Digit Sum	✓		8
719	Number Splitting	✓		8
751	Concatenation Coincidence	✓		8
822	Square the Smallest	✓		8
836	A Bold Proposition	✗	✗	7 8
850	Fractions of Powers			8
851	SOP and POS			8
852	Coins in a Box			8
855	Delphi Paper			8
857	Beautiful Graphs			8
864	Square + 1 = Squarefree			8
867	Tiling Dodecagon			8
870	Stone Game IV			8
876	Triplet Tricks			8
879	Touch-screen Password			8
880	Nested Radicals			8
881	Divisor Graph Width			8
882	Removing Bits			8
883	Remarkable Triangles			8

Footnotes

1. Project Euler Problem solved through ProjectEuler+ Challenge code ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸

2. Previously named "Multiples of 3 and 5": https://projecteuler.chat/viewtopic.php?t=7316. The ProjectEuler+ Challenge still has this name. ↩

3. Project Euler Problem (Descriptions /) Titles previously did not use title case: https://web.archive.org/web/20230528105433/https://projecteuler.net/archives. This is still reflected in the ProjectEuler+ Challenge name. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹

4. Project Euler Problem solved through ProjectEuler+ Challenge code, with adjustment of constant variable(s) ↩ ↩² ↩³ ↩⁴

5. The ProjectEuler+ Challenge has a different name: "Number to Words" ↩

6. Project Euler Problem solved through ProjectEuler+ Challenge code, optionally using the file given as part of the problem ↩

7. No code necessary ↩ ↩²

8. No corresponding ProjectEuler+ Challenge yet ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴