login
A082474
Numbers n such that n=phi(x)*sigma(x) for some x<=n.
1
1, 3, 8, 14, 24, 48, 60, 72, 78, 112, 120, 144, 168, 192, 234, 248, 288, 336, 360, 384, 480, 504, 528, 576, 620, 672, 720, 840, 864, 960, 1008, 1080, 1092, 1152, 1344, 1368, 1440, 1584, 1680, 1848, 1860, 1872, 1984, 2160, 2208, 2304, 2352, 2394, 2520, 2688
OFFSET
1,2
LINKS
PROG
(PARI) isok(n) = {for (x=1, n, if (eulerphi(x)*sigma(x) == n, return (1)); ); return (0); } \\ Michel Marcus, Dec 04 2013
CROSSREFS
Sequence in context: A257644 A135940 A126430 * A245181 A241563 A055335
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Apr 27 2003
STATUS
approved