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A303269 Sum of squares of odd digits minus sum of squares of even digits of n. 2

%I #6 May 18 2018 19:47:24

%S 0,1,-4,9,-16,25,-36,49,-64,81,1,2,-3,10,-15,26,-35,50,-63,82,-4,-3,

%T -8,5,-20,21,-40,45,-68,77,9,10,5,18,-7,34,-27,58,-55,90,-16,-15,-20,

%U -7,-32,9,-52,33,-80,65,25,26,21,34,9,50,-11,74,-39,106,-36,-35,-40,-27

%N Sum of squares of odd digits minus sum of squares of even digits of n.

%C Up to 10^4, resp. 10^5, there are 5824, resp. 59316, positive terms. All terms from a(1) to a(11111) are nonzero: see A076164 for indices of zeros.

%o (PARI) A303269(n)=-vecsum(apply(d->d^2*(-1)^d,digits(n)))

%Y Cf. A076164, A071650, A036301.

%K sign,base

%O 0,3

%A _M. F. Hasler_, May 18 2018

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)