Some of the most powerful ideas in computer science can be expressed in a single line.

fib(n) = fib(n-1) + fib(n-2) defines the recursive nature of the Fibonacci sequence — a classic foundation for understanding algorithms and computational thinking.

For many developers, this is the first real encounter with recursion: a simple rule that expands into increasingly complex patterns.

From coding exercises to technical interviews, Fibonacci remains a symbol of how elegant logic scales into infinite structures.

Simple rule. Infinite growth. Pure recursion.

Because sometimes the most interesting problems begin with a single recursive definition.

Product details

100% organic ring-spun cotton
5.3 oz./yd² (180 g/m²)
Single jersey construction
Medium fit
Set-in sleeves
1 × 1 ribbed collar
Double-needle stitching (sleeves & hem)
Self-fabric neck tape

Certified under GOTS and OCS. OEKO-TEX Standard 100 certified. PETA-Approved Vegan.

Blank product sourced from Bangladesh.

Note: Sizes correspond to a smaller fit in the US market. US customers may prefer ordering one size up.

Made on demand

This product is made especially for you as soon as you place an order, helping reduce overproduction.

Compliance

• Traceability:
- Weaving—Bangladesh
- Dyeing—Bangladesh
- Manufacturing—Bangladesh
• Contains 0% recycled polyester
• Contains 0% dangerous substances

Age restrictions: For adults
EU Warranty: 2 years
Meets EU REACH requirements

In compliance with the General Product Safety Regulation (GPSR), Developers Threads and SINDEN VENTURES LIMITED ensure product safety and EU standards.
Contact: gpsr@sindenventures.com
Address: Markou Evgenikou 11, Limassol, Cyprus

Size guide