Number Sequences: Hard
IntellectualThe toughest sequence test — tribonacci, prime-index jumps, interleaved fractions and powers, and multi-operation chains designed to mirror the difficulty level of real pilot assessments.
Overview
The Hard Number Sequences test is the most demanding sequence drill in the platform. It draws from 39 sequence types — including all 13 patterns from the Medium level plus 26 advanced variants featuring tribonacci recurrences, prime-index progressions, interleaved fractional sub-sequences, power-of expressions, mixed-number fractions, and multi-operation chains like *3-1 or /3/2-1. Every question offers five multiple-choice options where the wrong answers represent plausible mistakes — wrong operation, off-by-one, one step short, or a similar-looking fraction.
Assessments
Tested in assessments at KLM.
Could show up in Schuhfried, cut-e / Aon, DLR, ADAPT and SHL-based selections.
Airline mappings are based on public information and may change.
Example: what comes next?
Each item shows a number sequence ending in a blank. Hard sequences use multiplicative or changing rules rather than fixed steps — test whether the term-to-term factor itself is moving. Pick the next value from the five options.
Each term is the previous one multiplied by a growing factor: ×2, ×3, ×4, ×5. The next factor is ×6, so 120 × 6 = 720 (these are the factorials). The traps use the wrong multiplier — 600 is ×5 again and 840 jumps to ×7.
Game Phases
Configure
Choose your preferred duration before starting.
Solve
Identify the pattern in each sequence and pick the next value from five options as quickly and accurately as you can.
Review
After finishing, review your score and inspect each question and your answer.
More Practice
Sequences
4 exercisesNumber Sequences: Full Test
The full progress test for number sequences — a mixed drill combining 30% easy, 40% medium and 30% hard sequence types to mirror the difficulty level of real pilot assessments.
Number Sequences: Easy
Spot the pattern and predict the next number in short numeric sequences — the foundation for harder sequence tests.
Number Sequences: Medium
Step up from easy — interleaved sub-sequences, alternating operations, squaring and square roots mixed into harder numeric patterns.
Letter Series
Spot the hidden rule in a row of letters and pick the next one — the letter analogue of number series, training serial induction on the alphabet.