10
10
A perfect octave
The sum of the 1st perfect number and 2nd perfect number is. . . 34!
If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.
10
10
10
He discovered the ratio of a perfect octave is 2:1.
Pythagoras, according to Greek history, was graduated from Nalinda in Eastern India.
perfect fourth !
A perfect octave
Spherical
Pythagoras
Arthur Pythagoras
Pythagoras studied odd and even numbers, triangular numbers, and perfect numbers. Pythagoreans contributed to our understanding of angles, triangles, areas, proportion, polygons, and polyhedra
Mostly geometry and number theory.