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A015708 Numbers k such that k | (phi(k) * sigma(k)) but (phi(k) + sigma(k))/k does not increase. 0
1, 84, 120, 162, 234, 252, 270, 486, 540, 588, 648, 672, 819, 936, 1350, 1458, 1536, 1550, 1638, 1764, 1782, 1800, 1872, 1920, 2268, 2325, 3000, 3042, 3240, 3276, 3402, 3564, 3724, 3780, 4116, 4374, 4464, 4650, 4680, 4704, 5292, 5376 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Richard K. Guy, Divisors and desires, Amer. Math. Monthly, 104 (1997), 359-360.
CROSSREFS
Sequence in context: A316834 A227734 A192322 * A114822 A099637 A274348
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 21 06:00 EST 2024. Contains 370219 sequences. (Running on oeis4.)