Problems

1 – 50 of 54

Problem Title Likes Solvers Difficulty

Problem 369. Basic electricity in a dry situation

Created by: AMITAVA BISWAS

Tags physics, current, cody5

524

Problem 44315. Predicting life and death of a memory-less light bulb

Created by: AMITAVA BISWAS

Tags random, probability, decay

306

Problem 361. Energy of a photon

Created by: AMITAVA BISWAS

Tags physics, frequency, energy

1311

Problem 2736. Pernicious Anniversary Problem

Created by: Jan Orwat

Tags easy, sequences, oeis

774

Problem 44370. Octoberfest festival

Created by: Andriy Kavetsky

Tags fibonacci, cody5

446

Problem 44314. A Simple Tide Gauge with MATLAB

Created by: AMITAVA BISWAS

Tags ocean, prediction, regression

365

Problem 44381. Cache me Outside

Created by: @bmtran (Bryant Tran)

Tags cody5, memoize

Problem 564. How to subtract?

Created by: AMITAVA BISWAS

Tags addition, cody5, X-Y

1472

Problem 44363. Is this is a Tic Tac Toe X Win?

Created by: Doug Hull

Tags cody5, noughts and crosses

484

Problem 44384. Find the nearest prime number

Created by: Matthew Eicholtz

Tags prime numbers, cody5

595

Problem 44358. I Plead the Fifth

Created by: goc3

Tags regexp, strings, string

383

Problem 44369. Circle/Pentagon Overlap

Created by: goc3

Tags geometry, circle, radius

298

Problem 44385. Extra safe primes

Created by: Matthew Eicholtz

Tags prime numbers, cody5, safe prime

697

Problem 44334. Sums of Multiple Pairs of Triangular Numbers

Created by: James

Tags triangular numbers, cody5

219

Problem 44307. The glass half full

Created by: HH

Tags contest, cody5

243

Problem 44321. Van Eck's Sequence's nth member

Created by: Mehmet OZC

Tags integer sequence, cody5, van eck's sequence

305

Problem 44342. Spot the First Occurrence of 5

Created by: Peng Liu

Tags cody5

394

Problem 44305. 5 Prime Numbers

Created by: goc3

Tags prime, primes, string

424

Problem 44319. Write c^3 as sum of two squares a^2+b^2

Created by: Mehmet OZC

Tags number theory, cody5

300

Problem 44360. Pentagonal Numbers

Created by: goc3

Tags series, number, sequence

614

Problem 44368. Inscribed Pentagon?

Created by: goc3

Tags geometry, circle, radius

277

Problem 44349. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.

Created by: James

Tags time, cody5

894

Problem 44311. Number of Even Elements in Fibonacci Sequence

Created by: Mehmet OZC

Tags fibonacci, cody5, big number

933

Problem 44338. Recaman Sequence - I

Created by: Mehmet OZC

Tags integer sequence, cody5

285

Problem 44375. Missing five

Created by: Alfonso Nieto-Castanon

Tags cody5

318

Problem 44339. Recaman Sequence - II

Created by: Mehmet OZC

Tags integer sequence, cody5, recaman sequence

249

Problem 44364. Is this a valid Tic Tac Toe State?

Created by: Doug Hull

Tags cody5

108

Problem 44372. Polarisation

Created by: Jan Orwat

Tags cody5, quantum, angles

248

Problem 44352. The Top 5 Primes

Created by: Peng Liu

Tags cody5

291

Problem 281. Acid and water

Created by: AMITAVA BISWAS

Tags cody5, exponential decay, fluid mixture

241

Problem 44386. Circumscribed Pentagon?

Created by: goc3

Tags geometry, circle, circumscribe

Problem 44365. An asteroid and a spacecraft

Created by: AMITAVA BISWAS

Tags projectile, mechanics, cody5

151

Problem 44310. Digit concentration in Champernowne's constant

Created by: Mehmet OZC

Tags cody5, champernowne's constant, big number

114

Problem 44344. The 5th Root

Created by: goc3

Tags root, power, cody5

532

Problem 44350. Breaking Out of the Matrix

Created by: James

Tags cody5, whoa, windowing

322

Problem 44341. Hexagonal numbers on a spiral matrix

Created by: Mehmet OZC

Tags big integer, cody5, hexagonal numbers

Problem 44306. Is it really a 5?

Created by: goc3

Tags regexp, string, number

296

Problem 44367. Inscribed Pentagon? 2

Created by: goc3

Tags geometry, circle, radius

Problem 44309. Pi Digit Probability

Created by: Mehmet OZC

Tags pi, string manipulation, histogram

422

Problem 44337. Sums of Distinct Powers

Created by: James

Tags binary, cody5, distinct powers

143

Problem 44316. Pandigital Multiples of 11 (based on Project Euler 491)

Created by: James

Tags projecteuler, pandigital, cody5

Problem 44340. Recaman Sequence - III

Created by: Mehmet OZC

Tags cody5, recaman sequence

Problem 44359. 5th Time's a Charm

Created by: goc3

Tags approximation, cody5, five

175

Problem 44380. ASCII Birthday Cake

Created by: @bmtran (Bryant Tran)

Tags art, birthday, ascii

211

Problem 44345. MATLAB Counter

Created by: Peng Liu

Tags cody5, nested function

239

Problem 44353. Group-wise Euclidean distance

Created by: Peng Liu

Tags speed, cody5

Problem 44374. Tautology

Created by: Jan Orwat

Tags regular expressions, cody5

Problem 44382. Parse me a Lisp

Created by: @bmtran (Bryant Tran)

Tags lisp, parse, cody5

Problem 44379. One track five lanes

Created by: Alfonso Nieto-Castanon

Tags cody5

Problem 44376. The sliding puzzle: 3D

Created by: HH

Tags puzzle, sliding, fifteen

1 – 50 of 54

Difficulty Rating

Problem Groups

Problems