Harmonic number calculator
Sum reciprocals of consecutive positive integers.
Open calculatorMaths & numbers
Everyday percentages, sequences and the numbers in between.
Showing 73–96 of 193 tools
Harmonic mean of three positive values calculator
Average positive rates when the quantities covered at each rate are equal.
Open calculatorRoot mean square of three values calculator
Measure the magnitude of signed values without cancellation between positive and negative observations.
Open calculatorSecond-order linear recurrence calculator
Calculate a term of a second-order recurrence from two starting values.
Open calculatorQuadratic finite difference extrapolation calculator
Predict the next equally spaced term assuming the second difference stays constant.
Open calculatorDescartes’ rule of signs for cubics calculator
Bound the counts of positive and negative roots of a cubic with real coefficients.
Open calculatorCubic discriminant calculator
Classify roots of a real cubic using the sign of its discriminant.
Open calculatorBitwise operations on unsigned integers calculator
Evaluate the three common bitwise operations on two 16-bit unsigned words.
Open calculatorFixed-width logical bit shift calculator
Shift a word left or right within its specified width and see discarded high bits.
Open calculatorFixed-width bit rotation calculator
Rotate a bit pattern in both directions without discarding any bits.
Open calculatorHamming distance between bit words calculator
Measure how many bit positions must change to turn one unsigned word into the other.
Open calculatorBinary reflected Gray code calculator
Convert unsigned words between ordinary binary and reflected Gray encoding.
Open calculatorHamming code parity bit count calculator
Size the parity positions for single-error correction using a binary Hamming code.
Open calculatorJosephus survivor position calculator
Find the last position left after repeatedly removing every kth person around a circle.
Open calculatorGoldbach prime pairs for an even number calculator
Enumerate prime pairs that add to the given even integer.
Open calculatorPrime neighbors and gap calculator
Locate the prime immediately below the input and the prime immediately above it.
Open calculatorFarey sequence of a given order calculator
Generate the sorted Farey sequence, including its two endpoints.
Open calculatorLinear Diophantine equation calculator
Find one integer pair and the steps that generate every other solution.
Open calculatorLuhn check digit for a short identifier calculator
Generate the final Luhn digit for an unsigned identifier body.
Open calculatorBounded ordered allocations calculator
Count distributions of identical items to labeled boxes with a per-box cap.
Open calculatorCircular seating arrangements calculator
Count circular arrangements with rotations identified and clockwise order preserved.
Open calculatorGrid paths around a blocked point calculator
Count shortest grid paths that never visit one specified grid point.
Open calculatorTree leaves from internal degree counts calculator
Recover the number of leaves of a tree from counts of vertices of degrees two through four.
Open calculatorSimple graph edge density calculator
Measure the fraction of possible edges present in a simple undirected graph.
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