LATENT REFERENCES / TAG2
Harshad Number
Original title: ハーシャッド数
This reference note belongs to Tag2 in Latent References, an archive curated by Keigo Yoshida. Its archive region is Chaos theory · Lorenz equations. The note preserves its source text and links so that readers can trace the material behind the 3D map.
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English translation of the archived note. JP shows the original text. Source links and literal code are retained; the translation does not update or independently verify the source claims.
A harshad number is a natural number whose sum of digits is among the divisors of the original number. For example, the divisors of 315 are (1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315), and the sum of its digits is 3 + 1 + 5 = 9.
ハーシャッド数（ハーシャッドすう、英: harshad number）とは、自然数の各位の数字和が元の数の約数に含まれている自然数である。 例えば、315の約数は (1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315) であって、各位の和は 3 + 1 + 5 = 9 である。
Source updated 2023-07-04 · Snapshot 2026-10-08
Source links and calculated neighbors
Cosine values measure shared lexical features, not truth, agreement or identical meaning. Original reference links are labeled separately.
- 330Computed lexical cosine similarity 0.450 · shared title, text, tags and references
- Zuckerman NumbersComputed lexical cosine similarity 0.185 · shared title, text, tags and references
- Ramanujan SummationComputed lexical cosine similarity 0.093 · shared title, text, tags and references