I thought the appearance of 2s (or 3s ...) in the coefficients of factor(x^n-1) was equivalent to >= three (or four ...) distinct primes dividing n, but it seems they can't all be 3 mod 4 since n=231 fails. Puzzle: find a trinomial with maximal |coefficient| < some coefficient of a(n irreducible) factor. --rwg RESINACEOUS COENURIASES DRACONTIASES STENOCARDIAS Biodiversity dept: Dracontiasis and coenuriasis are unbelievably icky parasitisms, but that's technically wrong since ick is a parasitism of fish! Main Entry:dracontiasis : infestation with or disease caused by the Guinea worm Main Entry:guinea worm Function:noun Usage:often capitalized G : a slender nematode worm (Dracunculus medinensis) attaining a length of several feet, occurring as an adult in the subcutaneous tissues of man and various mammals in parts of Africa and other warm countries, and having a larva that develops in small freshwater crustaceans (as cyclops) and when ingested with drinking water passes through the intestinal wall and tissues to lodge beneath the skin of a mammalian host and there mature Webster spares us their reproductive revels, which are worthy of an Aliens movie. Main Entry:coenurus Pronunciation:s**n(y)*r*s, s*- Function:noun Inflected Form:plural coenuri \-*r*, -(*)r*\ Etymology:New Latin, from coen- + -urus : a complex tapeworm larva growing interstitially in vertebrate tissues and consisting of a large fluid-filled sac from the inner wall of which numerous scolices develop see GID, MULTICEPS; Main Entry:gid Pronunciation:*gid Function:noun Inflected Form:-s Etymology:back-formation from 1giddy : a disease principally affecting sheep that is caused by the presence in the brain of the coenurus of a tapeworm (Multiceps multiceps) of the dog and related carnivores and is characterized by cerebral disturbances, dilated pupils, dizziness and circling movements, emaciation, and usually death called also sturdy, turn-sick, waterbrain