OFFSET
1,1
COMMENTS
For a(1) = A000010(A000292(5)) = A000010(A000292(6)) = A000010(A000292(7)), this reduces to A000010(5*7) = A000010(8*7) = A000010(12*7). The number 7 is relatively prime to 5, 8, and 12 which are inverses of the totient value 4. 7 appears in the numerator of A000292(5), A000292(6), and A000292(7). Following the same process 11 and 17 replace 7 for a(2) and a(3).
Conjecture: There are at most three consecutive tetrahedral pyramidal numbers in the set of inverses of a totient number.
EXAMPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Torlach Rush, Sep 06 2018
STATUS
approved