Figure Figure Calculator
Free online figure figure calculator. Enter your values and get instant results with the formula, step-by-step working, a worked example and FAQs — everything runs locally in your browser on Calcton, no signup required.
双序列对照（A005228 / A030124）
R: 1, 3, 7, 12, 18, 26, 35, 45, 56, 69, 83, 98
S: 2, 4, 6, 9, 11, 14, 16, 20, 22, 25, 27, 30
规则：R(1) = 1，R(n) = R(n−1) + S(n−1)，而 S(n) 是既不在 R 也不在 S 中出现过的最小正整数。R 与 S 合起来恰好不重不漏覆盖全部正整数，比例 R(n)/n → φ（黄金比）。
How to use the Figure Figure Calculator
- Fill in the inputs with your own numbers — every field shows what it expects.
- The result updates instantly as you type; no "Calculate" click needed.
- Read the result card for the main figure, the step-by-step formula, and practical notes.
Frequently asked questions
Is the Figure Figure Calculator free?
Yes — all math calculators on Calcton are free, with no sign-up required. Your inputs are processed in your browser and never sent to a server.
Is there a Chinese version of this tool?
Yes. Use the Chinese version link above — it is the same calculator with the interface in Simplified Chinese.
References
Formulas and benchmarks used by this calculator follow these published sources.
KevinContent LeadCalcton Editorial Team · Last updated 2026-09-25
Kevin maintains Calcton's formula verification and content: every calculator cites the standard it implements, worked examples are recomputed programmatically, and health benchmarks follow WHO and international guidelines.
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About math calculators
Free online math calculators for algebra, statistics, number theory and everyday arithmetic — from quadratic equations and matrices to percentages, fractions and prime factorization, each with step-by-step formulas.