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 A268227 a(n) = sum of digits of (2n)^2. 2
 0, 4, 7, 9, 10, 1, 9, 16, 13, 9, 4, 16, 18, 19, 19, 9, 7, 13, 18, 13, 7, 18, 19, 10, 9, 7, 13, 18, 13, 16, 9, 19, 19, 18, 16, 13, 18, 22, 25, 18, 10, 19, 18, 25, 22, 9, 22, 25, 18, 19, 1, 9, 16, 13, 18, 4, 16, 27, 19, 19, 9, 25, 22, 27, 22, 16, 18, 28, 28, 18, 16, 13, 18, 13, 16, 9, 10, 19, 18 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 0..1000 H. I. Okagbue, M. O. Adamu, S. A. Iyase, A. A. Opanuga, Sequence of Integers Generated by Summing the Digits of their Squares, Indian Journal of Science and Technology, Vol 8(15), DOI: 10.17485/ijst/2015/v8i15/69912, July 2015. MATHEMATICA Total[IntegerDigits[#]]&/@((2*Range[0, 80])^2) (* Harvey P. Dale, Sep 14 2016 *) PROG (PARI) a(n) = sumdigits((2*n)^2); \\ Michel Marcus, Jul 23 2016 CROSSREFS Bisection of A004159. Cf. A268228. Sequence in context: A085108 A106502 A046254 * A123573 A085746 A324599 Adjacent sequences:  A268224 A268225 A268226 * A268228 A268229 A268230 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Jan 31 2016 STATUS approved

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Last modified May 13 02:02 EDT 2021. Contains 343836 sequences. (Running on oeis4.)