OFFSET
1,2
COMMENTS
Conjecture: a(n) exists for any n > 0. Moreover, a(n) <= n*(n-1) for all n > 1.
Note that for n > 1 the term a(n) should be even.
LINKS
Zhi-Wei Sun, Table of n, a(n) for n = 1..10000
EXAMPLE
a(10) = 40 since phi(40+10) = 20 divides 40.
MATHEMATICA
Do[m=1; Label[aa]; If[Mod[m, phi[m+n]]==0, Print[n, " ", m]; Goto[bb]]; m=m+1; Goto[aa]; Label[bb]; Continue, {n, 1, 60}]
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Zhi-Wei Sun, Oct 08 2014
STATUS
approved