7777/7776: Difference between revisions

| Name = power of 6 repdigit comma

'''7777/7776''', the '''power of 6 repdigit comma''' or '''pulsar comma''' is an unnoticeable comma of 223 millicents, and it is a part of 101-limit just intonation.  

The comma derives from the resemblance of a perfect power of 6, 7776, to a repdigit number 7777. It is the difference between a stack of 5 [[6/1|hexataves]] and 7, 11, and 101 harmonics stacked, or when octave-reduced, between 7/4, 11/8, and 101/64 and the Pythagorean major seventh, [[243/128]]. It is also the difference between 404/243 and 128/77.  

The name origin is the following: '''p'''ower of '''s'''ix '''r'''epdigit - '''psr''', which is the astronomical shortening for pulsars.  

Tempering it out leads to the [[stellar remnants]] collection of temperaments, the core of which is the 2.3.7.11.101 subgroup. Some of the EDOs which support pulsar temperaments are [[135edo|135]], {{EDOs|342, 207, 1012, 477, 1147, 971, 270, 836, 877}}. Note that 270edo is a multiple of 135edo.