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A065388
Record values for sigma(m) + phi(m): sum of sigma and totient is larger than for any previous number.
2
2, 4, 6, 9, 10, 14, 19, 22, 32, 39, 45, 50, 68, 80, 103, 106, 108, 140, 144, 184, 219, 248, 258, 284, 316, 392, 451, 528, 594, 624, 672, 808, 816, 915, 948, 955, 1088, 1266, 1440, 1640, 1704, 1824, 1843, 2020, 2031, 2176, 2208, 2610, 3072, 3304, 3512, 3888
OFFSET
1,1
LINKS
FORMULA
a(n) = sigma(A015702(n)) + phi(A015702(n));
a(n) = A000203(A015702(n)) + A000010(A015702(n)).
PROG
(PARI) { n=r=0; for (m=1, 10^9, x=sigma(m) + eulerphi(m); if (x > r, r=x; write("b065388.txt", n++, " ", x); if (n==500, return)) ) } \\ Harry J. Smith, Oct 17 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Nov 05 2001
STATUS
approved