OFFSET
1,3
COMMENTS
Among the terms of this sequence, there are:
the numbers of the form 10^(4*k) with k >= 0;
the numbers of the form (10^i + 10^j)^4 with i > j >= 0.
LINKS
Stefano Spezia, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A371047(n)^4.
MATHEMATICA
Select[Range[0, 2500]^4, IntegerQ[DigitSum[#]^(1/4)]&]
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Stefano Spezia, Mar 08 2024
STATUS
approved