Prielipp (1970), Theorem 1, pp. 693–694. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
Prielipp (1970), Theorem 2, p. 694. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
Prielipp (1970), Theorem 7, p. 695. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
Prielipp (1970), Theorem 3, p. 694. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
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Prielipp (1970), Theorem 1, pp. 693–694. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
Prielipp (1970), Theorem 2, p. 694. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
Prielipp (1970), Theorem 7, p. 695. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.
Prielipp (1970), Theorem 3, p. 694. Prielipp, Robert W. (1970). "Perfect numbers, abundant numbers, and deficient numbers". The Mathematics Teacher. 63 (8): 692–696. doi:10.5951/MT.63.8.0692. JSTOR27958492.