Hosoya's triangle

Hosoya's triangle

Hosoya's triangle or the Fibonacci triangle is a triangular arrangement of numbers (like Pascal's triangle) based on the Fibonacci numbers. Each number is the sum of the two numbers above in either the left diagonal or the right diagonal. The first few rows are:

1 1 1 2 1 2 3 2 2 3 5 3 4 3 5 8 5 6 6 5 8 13 8 10 9 10 8 13 21 13 16 15 15 16 13 21 34 21 26 24 25 24 26 21 34 55 34 42 39 40 40 39 42 34 55

(See OEIS|id=A058071). The recurrence relation is "H"(0, 0) = "H"(1, 0) = "H"(1, 1) = "H"(2, 1) = 1 and "H"("n", "j") = "H"("n" - 1, "j") + "H"("n" - 2, "j") or "H"("n", "j") = "H"("n" - 1, "j" - 1) + "H"("n" - 2, "j" - 2).

The entries in the triangle satisfy the identity:"H"("n","i") = "F"("i" + 1) × "F"("n" − "i" + 1).

Thus, the two outermost diagonals are the Fibonacci numbers, while the numbers on the middle vertical line are the squares of the Fibonacci numbers. All the other numbers in the triangle are the product of two distinct Fibonacci numbers greater than 1. The row sums are the convolved Fibonacci numbers (OEIS2C|id=A001629).

References

* Haruo Hosoya, "Fibonacci Triangle" "The Fibonacci Quarterly" 14 2 (1976): 173 - 178
* Thomas Koshy, "Fibonacci and Lucas Numbers and Applications". New York: Wiley & Sons (2001): 187 - 195


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • List of mathematics articles (H) — NOTOC H H cobordism H derivative H index H infinity methods in control theory H relation H space H theorem H tree Haag s theorem Haagerup property Haaland equation Haar measure Haar wavelet Haboush s theorem Hackenbush Hadamard code Hadamard… …   Wikipedia

  • Triangular array — Not to be confused with Triangular matrix. The triangular array whose right hand diagonal sequence consists of Bell numbers In mathematics and computing, a triangular array of numbers, polynomials, or the like, is a doubly indexed sequence in… …   Wikipedia

  • Mummy the Peepshow — Datos generales Origen Osaka Japón Información artística …   Wikipedia Español

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”