[seqfan] UnitaryPhi

[zbi74583_boat at yahoo.co.jp]

    Hi Seqfans    See A145680  It is defined as follow
    The smallest number m such that UnitarySigma(m)=(n+1)/n*m
    I replaced UniitarySigma by   UnitaryPhi
    The smallest number m such that UnitaryPhi(m)=(n-1)/n*m
    a(n) : 2, 3, 4, 5, 144, 7, 8, 9, 400, 11, -, 13, 2^12*3^4*5^2*7^2, 2^9*3^4*5^2*73, 16, 17, 2^8*3^4*5^2, 19, -
    I computed some term   mentally  Could anyone confirm them and compute more terms?  Still a(12) is unknown


    Yasutoshi