OFFSET
1,2
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
FORMULA
MATHEMATICA
Differences[Total[IntegerDigits[#]]&/@(Range[0, 80]^2)] (* Harvey P. Dale, Mar 10 2019 *)
PROG
(Haskell)
a240752 n = a240752_list !! (n-1)
a240752_list = zipWith (-) (tail a004159_list) a004159_list
(PARI) a(n) = sumdigits(n^2) - sumdigits((n-1)^2); \\ Michel Marcus, Jan 24 2022
(Python)
def A240752(n): return sum(map(int, str(m:=n**2)))-sum(map(int, str(m-(n<<1)+1))) # Chai Wah Wu, Mar 15 2023
CROSSREFS
KEYWORD
sign,base
AUTHOR
Reinhard Zumkeller, Apr 12 2014
EXTENSIONS
Formulas adapted to offset by Michel Marcus, Jan 25 2022
STATUS
approved