OFFSET
1,1
COMMENTS
First differs from A322336 in lacking 2535 = prime(2)*prime(3)*prime(6)^2.
EXAMPLE
The sequence of terms together with their prime indices begins:
9: {2,2}
21: {2,4}
25: {3,3}
27: {2,2,2}
39: {2,6}
49: {4,4}
57: {2,8}
63: {2,2,4}
65: {3,6}
81: {2,2,2,2}
87: {2,10}
91: {4,6}
111: {2,12}
115: {3,9}
117: {2,2,6}
121: {5,5}
125: {3,3,3}
129: {2,14}
133: {4,8}
147: {2,4,4}
MATHEMATICA
Select[Range[100], #>1&&!PrimeQ[#]&&GCD@@PrimePi/@First/@FactorInteger[#]>1&]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Sep 22 2019
STATUS
approved