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Number Sequence Calculator
nth term and sum of arithmetic & geometric sequences.
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Type
Results
nth Term
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Sum of First n Terms
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How to use the Number Sequence Calculator
Arithmetic: add d each step. Geometric: multiply by r each step.
Frequently Asked Questions
1+2+...+100 = 5050 — young Gauss paired them (1+100, 2+99...) to get 50×101.