OFFSET
1,2
EXAMPLE
a(3) = 271 because 271*3^4 + 1 = 21952 = 28^3.
MATHEMATICA
a={}; Do[k = 2; While[ !IntegerQ[(k^n - 1)/n^4], k++ ]; AppendTo[a, (k^n-1)/n^4], {n, 1, 20}]; a
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Sep 10 2012
STATUS
approved