A144408 Last digit of A135266(n).
0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2, 6, 9, 9, 1, 6, 0, 0, 1, 5, 9, 0, 2
Offset: 0
Formula
Period 12: a(n+12)=a(n).
Sums of periodic trisections: a(3n)+a(3n+3)+a(3n+6)+a(3n+9) = a(3n+1)+a(3n+4)+a(3n+7)+a(3n+10) = a(3n+2)+a(3n+5)+a(3n+8)+a(3n+11) = 16.
G.f.: x(6x^7-5x^6+8x^5+6x^4-8x^3+4x^2+4x+1)/((1-x)(1+x)(x^2+1)(x^2-x+1)(x^4-x^2+1)). - R. J. Mathar, Dec 02 2008
Extensions
Edited by R. J. Mathar, Dec 02 2008