What you can do
- Arithmetic (AS) and geometric (GS) nth terms, interval sums, solving for n or k, and two-term inference
- Generate copy-ready tables of t_n and cumulative S_n for any interval
- Display every substitution in a dedicated “How it’s calculated” column for classroom-friendly steps
- Share URLs, copy LaTeX, toggle teacher notes, and load comments on demand
Mode
Result
How it's calculated
FAQ
How are logarithms handled when solving geometric terms?
For r > 0 we solve n = n0 + log(T/a1) / log(r). For r < 0 we additionally enforce |r|^k = |T/a1| and (-1)^k = sign(T/a1); otherwise the tool reports that the parity constraint fails.
Can I export the generated table?
Yes. After computing, click “Copy as CSV” to push a tidy n,t_n,S_n table to your clipboard, ready for spreadsheets or LMS uploads.