# Sequence value given index

## How to use this calculator?

### Field 'Index variable'

Input a letter which represents the sequence variable. For example,

For the sequence of general term a_{n}= 2n+1, input 'n'.

For the sequence a_{k}= 8k-9, input 'k'.

### Field 'Sequence'

Input the general term of the sequence that you want to evaluate for a given index.

You may input numbers, fractions, operators and functions.

- Operators : + - * / et ^ (power)

- Common functions : sqrt (= square root), log, exp, etc

- Trigonometric functions : cos, sin, tan, cot, etc.

More details

### Field 'Index'

Input a whole number that is the index for which the sequence will be evaluated.

## Examples

- What is the value of the sequence defined by `a_n = (4*n)/sqrt(n+1)` for n = 10 ?

Value of a_{10}

- What is an approximation of the value of the sequence defined by `U_k = cos((pi*k)/7)/(k^2+1)` for k = 5 ?

Approximation of a_{5}

## See also

All Sequence Calculators

Maths Calculators