OFFSET
1,1
COMMENTS
If d(n) increases phi(n) tends to go down so the sum has a significance.
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
EXAMPLE
a(20) = d(20) + phi(20) = 6 + 8 = 14.
MAPLE
with(numtheory); A061468 := n-> tau(n) + phi(n);
MATHEMATICA
Table[DivisorSigma[0, n]+EulerPhi[n], {n, 70}] (* Harvey P. Dale, Aug 22 2020 *)
PROG
(PARI) { for (n=1, 1000, write("b061468.txt", n, " ", numdiv(n) + eulerphi(n)) ) } \\ Harry J. Smith, Jul 23 2009
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Amarnath Murthy, May 04 2001
EXTENSIONS
More terms from Winston C. Yang (winston(AT)cs.wisc.edu), May 19 2001
STATUS
approved