Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
AW+HCWDHE♭HEW+HGWA
What is true of it
A blues is A, C, D, E♭, E and G, and back to A.
Its steps are W+H – W – H – H – W+H – W, where W is a whole step and H a half.
Across the first twelve frets of the ukulele its notes fall in 28 places, which is what makes a scale a shape rather than a list.
Chords made only of these notes
Found by testing every chord in the catalogue against these 6 sounds, not chosen.
Other scales on A
A major pentatonicpentatonicA minor pentatonicpentatonicA major bluespentatonicA majormajorA natural minorminorA harmonic minorminor
C bluesC♯ bluesD♭ bluesD bluesD♯ bluesE♭ bluesE bluesF bluesall 374