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A240752 First differences of digit sums of squares, cf. A004159. 5
1, 3, 5, -2, 0, 2, 4, -3, -1, -8, 3, 5, 7, 0, -7, 4, 6, -10, 1, -6, 5, 7, 0, 2, -5, 6, -1, 1, -6, -4, 7, -9, 11, -5, -3, 8, 1, -6, -4, -2, 9, 2, 4, -3, -10, 1, 3, -4, -2, 0, 2, 4, 6, -1, -8, 3, 5, -2, 0, -7, 4, 6, 8, -8, -6, 5, 7, -9, 2, -5, -3, 8, 1, 3, -4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A007953(A000290(n+1)) - A007953(A000290(n)).

a(A202089(n)) = 0; a(A239878(n)) = 1; a(A240754(n)) = -1.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A004159(n+1) - A004159(n).

PROG

(Haskell)

a240752 n = a240752_list !! (n-1)

a240752_list = zipWith (-) (tail a004159_list) a004159_list

CROSSREFS

Sequence in context: A204161 A278968 A220110 * A021288 A140735 A183206

Adjacent sequences:  A240749 A240750 A240751 * A240753 A240754 A240755

KEYWORD

sign,base

AUTHOR

Reinhard Zumkeller, Apr 12 2014

STATUS

approved

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Last modified February 17 15:19 EST 2019. Contains 320220 sequences. (Running on oeis4.)