MATH
Sequences & series calculators
Find an arithmetic sequence term or finite sum, or a term in a positive geometric sequence, from your supplied first term and step or ratio.
Choose the right tool
Select one of the explicitly supported term counts in the menu. Arithmetic steps may be signed; geometric ratios and first terms must be positive. These tools do not infer a sequence rule from observations or calculate an infinite sum.
8 tools
- Arithmetic Sequence Nth Term Calculator
Arithmetic Sequence Nth Term. Number of terms: 1, 2, 3, 5, 10, 20, 50, 100 only. Example: First: 2 number, Difference: 3 number, Number of terms: 10 count gives 29 number. Exactly one selected nth term; n selected from1,2,3,5,10,20,50,100. Dimensionless terms, signed difference allowed. Only this original stated job is proposed, not full historical source coverage. Input domains and output unit mu
- Choose Two from n=0…7 Calculator
Choose Two from n=0…7. N: 0, 1, 2, 3, 4, 5, 6, 7 only. Example: N: 5 number gives 10 number. Choose2 only, n0..7 finite integer choices; arbitrary n,k deferred. Original useful product scope; historical catalog title does not grant missing modes or source parity.
- Factorial for n=0…7 Calculator
Factorial for n=0…7. N: 0, 1, 2, 3, 4, 5, 6, 7 only. Example: N: 3 number gives 6 number. Explicit8 integer choices only; larger n intentionally deferred, no continuous coercion. Original useful product scope; historical catalog title does not grant missing modes or source parity.
- Fibonacci Number Fₙ for n=0…7 Calculator
Fibonacci Number Fₙ for n=0…7. N: 0, 1, 2, 3, 4, 5, 6, 7 only. Example: N: 3 number gives 2 number. Explicit8 integer choices only; larger n intentionally deferred, no continuous coercion. Original useful product scope; historical catalog title does not grant missing modes or source parity.
- Finite Arithmetic Sequence Sum Calculator
Finite Arithmetic Sequence Sum. Number of terms: 1, 2, 3, 5, 10, 20, 50, 100 only. Example: First: 2 number, Difference: 3 number, Number of terms: 10 count gives 155 number. Arithmetic sequence only; n selected from1,2,3,5,10,20,50,100. No general or infinite series claim. Only this original stated job is proposed, not full historical source coverage. Input domains and output unit must be visible
- Harmonic Number Hₙ for n=1…8 Calculator
Harmonic Number Hₙ for n=1…8. N: 1, 2, 3, 4, 5, 6, 7, 8 only. Example: N: 3 number gives 1.83333333333 number. Explicit8 integer choices only; larger n intentionally deferred, no continuous coercion. Original useful product scope; historical catalog title does not grant missing modes or source parity.
- Positive Geometric Sequence Nth Term Calculator
Positive Geometric Sequence Nth Term. Term number: 1, 2, 3, 4, 5, 10, 15, 20 only. Example: First: 2 number, Ratio: 1.5 number, Term number: 10 count gives 76.88671875 number. Positive dimensionless terms and ratio; n selected from1,2,3,4,5,10,15,20; no alternating or infinite series claim. Only this original stated job is proposed, not full historical source coverage. Input domains and output uni
- Triangular Number for a Selected Positive Index Calculator
Triangular Number for a Selected Positive Index. Positive index: 1, 2, 3, 5, 10, 50, 100, 1000 only. Example: Positive index: 10 count gives 55 count. Index selected from1,2,3,5,10,50,100,1000; dimensionless count, no arbitrary fractional index. Only this original stated job is proposed, not full historical source coverage. Input domains and output unit must be visible.
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