Look up a number
About this tool
This page indexes a curated set of numbers documented on Codex Numerica, with each entry linking to the page where the number is discussed in full. Entries are grouped by evidence grade so you can scan verified attestations before remarkable, disputed, or exploratory ones.
The computed properties panel uses the input number directly — prime factorization (trial division), triangular and square flags, perfect-number check (for small inputs), digit sum, and digital root. Computation is performed in the browser; the input itself is never sent anywhere.
The OEIS link opens a search in the On-Line Encyclopedia of Integer Sequences — an external community-maintained reference that catalogues hundreds of thousands of integer sequences with their references and properties.
Why this exists
Most numerical claims this site catalogues are buried inside long discussions on individual tradition pages. The lookup gives an alternate route: start with the number, find every tradition that has something to say about it, and follow the link to the discussion. It pairs naturally with the Sacred Numbers survey (deep on five anchor numbers) and the Sacred Numbers Lab (extended profiles of five more).
Coverage caveat
The dataset is curated, not exhaustive. It covers the most prominent numbers across the traditions represented on Codex Numerica, but does not attempt to catalogue every numerical claim ever made. If you enter a number with no recorded attestations, the computed-properties panel still works; an empty attestation list means “not in our curated index,” not “not significant anywhere.”