Arithmetic Sequence Calculator

Number of input items(n):
Enter the first number(a)：
Input tolerance(d)：
The nth number an is：
The sum of the first n items：

Arithmetic sequence is a common type of sequence. If the difference between each term and the previous term of a sequence starting from the second term is equal to the same constant, this sequence is called an arithmetic sequence, and this constant is called the common difference of the arithmetic sequence. The common difference is usually represented by the letter d. For example: 1,3,5,7,9...1+2(n-1).

The general formula of an arithmetic sequence is: an=a1+(n-1)d (1) The formula for the sum of the first n terms is: or Sn=n(a1+an)/2. Note: The above n are all positive integers.