Problems

1 – 17 of 17

Problem Title Likes Solvers Difficulty

Problem 52060. Identify Ruth-Aaron numbers

Created by: ChrisR

Tags number theory, baseball, factor sum

Problem 51820. Count unique orderings of vertices of a polygon

Created by: ChrisR

Tags combinatorics, permutations, sequence

Problem 51274. Solve a nonlinear difference equation

Created by: ChrisR

Tags sequence, recurrence, difference equation

Problem 52283. Find numbers in the Popular Computing Z-sequence

Created by: ChrisR

Tags sequence

Problem 53120. Compute the Sequence of the Day

Created by: ChrisR

Tags sequence

Problem 52624. Determine whether a number is a fibodiv number

Created by: ChrisR

Tags strings, fibonacci, sequence

Problem 52619. Find the nth nude number

Created by: ChrisR

Tags digits, sequence, divisibility

Problem 53880. List the vile numbers

Created by: ChrisR

Tags binary, number theory, anagrams

Problem 51813. Sum the elements in rows of the Levine triangle

Created by: ChrisR

Tags sequence, astronomical growth

Problem 54345. Fill a rectangle with 1x1 and 2x2 tiles

Created by: ChrisR

Tags tiles, sequence

Problem 53910. List the dopey numbers

Created by: ChrisR

Tags binary, number theory

Problem 51950. Find the smallest integer m such that n divides m!

Created by: ChrisR

Tags sequence, factorial, divisibility

Problem 52629. Count the ways to draw non-intersecting chords between points on a circle

Created by: ChrisR

Tags combinatorics, geometry, sequence

Problem 51715. Iterate the sum of divisors and totient

Created by: ChrisR

Tags number theory, sequence, divisors

Problem 54355. Compute a determinant

Created by: ChrisR

Tags large numbers, sequence, determinant

Problem 53990. Classify product/digit-sum sequences

Created by: ChrisR

Tags number theory, sequence, noeis

Problem 52644. List modest numbers up to n

Created by: ChrisR

Tags sequence, divisibility

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Problems

Problem 52060. Identify Ruth-Aaron numbers

Problem 51820. Count unique orderings of vertices of a polygon

Problem 51274. Solve a nonlinear difference equation

Problem 52283. Find numbers in the Popular Computing Z-sequence

Problem 53120. Compute the Sequence of the Day

Problem 52624. Determine whether a number is a fibodiv number

Problem 52619. Find the nth nude number

Problem 53880. List the vile numbers

Problem 51813. Sum the elements in rows of the Levine triangle

Problem 54345. Fill a rectangle with 1x1 and 2x2 tiles

Problem 53910. List the dopey numbers

Problem 51950. Find the smallest integer m such that n divides m!

Problem 52629. Count the ways to draw non-intersecting chords between points on a circle

Problem 51715. Iterate the sum of divisors and totient

Problem 54355. Compute a determinant

Problem 53990. Classify product/digit-sum sequences

Problem 52644. List modest numbers up to n