Odd triperfect numbers are divisible by eleven distinct prime factors
Abstract: We prove that an odd triperfect number has at least eleven distinct prime factors.
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W. E. Beck & R. M. Najar, "A lower bound for odd triperfects," Math. Comp., v. 38, 1982, pp. 249-251.
G. L. Cohen, "On odd perfect numbers II, Multiperfect numbers and quasiperfect numbers," J. Austral. Math. Soc., v. 29, 1980, pp. 369-384.
M. Kishore, "Odd triperfect numbers," Math. Comp., v. 42, 1984, pp. 231-233.
W. McDaniel, "On odd multiply perfect numbers," Boll. Un. Mat. Ital. (4), v. 3, 1970, pp. 185-190.
C. Pomerance, "Odd perfect numbers are divisible by at least seven distinct primes," Acta Arith., v. 25, 1973/1974, pp. 265-300.
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