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 A089904 Sum of digits of numbers between 0 and (2/9)*(10^n-1). 6
 0, 3, 109, 2055, 30501, 404947, 5049393, 60493839, 704938285, 8049382731, 90493827177, 1004938271623, 11049382716069, 120493827160515, 1304938271604961, 14049382716049407, 150493827160493853 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS From a suggestion of Yalcin Aktar LINKS FORMULA a(n)=s(2, n-1) where s(a, k)=a*(k+1)+a^2*sum(i=0, k, i*10^(k-i))+sum(i=0, k, 5*a*(9*(k-i)+a- 1)*10^(k-i-1)) CROSSREFS Cf. A089903, A089905, A089906, A087330, A089907, A089908, A089909, A034967. Sequence in context: A053861 A041635 A142533 * A092252 A201001 A114738 Adjacent sequences:  A089901 A089902 A089903 * A089905 A089906 A089907 KEYWORD nonn,base AUTHOR Benoit Cloitre, Nov 14 2003 STATUS approved

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