Prime Number Spiral 7.47

The Prime Number Spiral (a.k.a. the Ulam Spiral) is formed by marking the prime numbers in a spiral arrangement of the natural numbers. This is software is for exploring the Prime Number Spiral.

See also: prime number spiral, prime numbers, primes, Ulam spiral, mathematical software

MITCalc - Torsion Springs 1.13

The calculation is intended for the purposes of geometric and strength designs of spiral cylindrical torsion springs made of wires and rods in circular sections, loaded with a static or cyclic loading. Application is developed in MS Excel, is multi-language and supports Imperial and Metric units. Is based on ANSI, ISO and DIN standards and support many 2D and 3D CAD systems.

See also: Spring, springs, cylindrical spring, torsion spring, spiral spring, EN 13906-2, DIN 2088, static strength check, dynamic strength check.