Sequences and Series VI

Curated by : ChrisR

Average Problem Difficulty:

Sixteen more problems on sequences

Community Group Solver

+50 points

Problem Title	Likes	Solvers
Problem 54355. Compute a determinant Created by: ChrisR Tags large numbers, sequence, determinant	0	9
Problem 54645. Determine whether the input is an anagram number Created by: ChrisR Tags sequence, anagram, wordplay	0	6
Problem 54660. Generate the Figure-Figure sequence Created by: ChrisR Tags sequence, figure/ground, hofstadter	2	10
Problem 54680. Determine whether a number is practical Created by: ChrisR Tags factors, number theory, sequence	2	6
Problem 54770. Count the peaceful queens Created by: ChrisR Tags chess, sequence, oblong	2	64
Problem 54775. Flip the parity of digits in a decimal expansion Created by: ChrisR Tags sequence, interesting plot	1	5
Problem 54780. Trap a knight Created by: ChrisR Tags spiral, chess, sequence	1	5
Problem 55280. Count estrangements Created by: ChrisR Tags permutations, arrangements, partner	1	7
Problem 56240. List numbers that are not squares Created by: ChrisR Tags sequence, annoying bans, you know where to look	1	18
Problem 56593. List the nth term of Rozhenko’s inventory sequence Created by: ChrisR Tags sequence, inventory, numberphile	1	9
Problem 56743. Count the unitary divisors of a number Created by: ChrisR Tags number theory, sequence	0	11
Problem 57288. Sum the unitary divisors of a number Created by: ChrisR Tags number theory, sequence	1	9
Problem 57293. Compute the unitary totient of a number Created by: ChrisR Tags number theory, sequence	1	4
Problem 57472. Compute the Lagarias Riemann Hypothesis sequence Created by: ChrisR Tags number theory, millennium problem, sloanes hateful eight	2	5
Problem 57487. Compute the largest number with a given integer complexity Created by: ChrisR Tags number theory, sequence	2	6
Problem 57492. Compute the Tetris sequence Created by: ChrisR Tags binary, sequence, facial recognition	1	5

Recent Group Finishers3

Recent Activity

	Augusto Mazzei submitted Solution 14018816 to Problem 56743. Count the unitary divisors of a number on 23 Jun 2024
	Augusto Mazzei submitted Solution 14018811 to Problem 57288. Sum the unitary divisors of a number on 23 Jun 2024
	Lincoln Poon submitted Solution 13961211 to Problem 54660. Generate the Figure-Figure sequence on 11 Jun 2024
	Lincoln Poon submitted Solution 13960961 to Problem 56743. Count the unitary divisors of a number on 11 Jun 2024
	GeeTwo submitted Solution 13801746 to Problem 57472. Compute the Lagarias Riemann Hypothesis sequence on 1 May 2024

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