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 A095026 Lower triangle T(j,k) read by rows, where T(j,k) is the number of occurrences of the digit k-1 as least significant digit in the base-j multiplication table. 1
 1, 3, 1, 5, 2, 2, 8, 2, 4, 2, 9, 4, 4, 4, 4, 15, 2, 6, 5, 6, 2, 13, 6, 6, 6, 6, 6, 6, 20, 4, 8, 4, 12, 4, 8, 4, 21, 6, 6, 12, 6, 6, 12, 6, 6, 27, 4, 12, 4, 12, 9, 12, 4, 12, 4, 21, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 40, 4, 8, 10, 16, 4, 20, 4, 16, 10, 8, 4, 25, 12, 12, 12, 12, 12, 12, 12 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Sum_{k=1..j} T(j,k) = j^2. Assumes a suitable continuation of the representation of digits in bases 11, 12 (9,A,B,..) LINKS Table of n, a(n) for n=1..86. David Book, The Multiplying Digits Problem. EXAMPLE a(2)=T(2,1)=3 because 3 of the 4 possible combinations of last digits in the product of two binary numbers produce 0 as last digit of the result. a(3)=T(2,2)=1 because only ...1 * ...1 gives a result with last digit=1. T(10,k)={27,4,12,4,12,9,12,4,12,4} gives the probability in percent (j^2=100) to get {0,1,2,...,9} as last decimal digit in the decimal representation of the product of two arbitrary integers. CROSSREFS The first column T(n, 1)=A018804(n). Sequence in context: A233940 A134033 A185051 * A184997 A094367 A092368 Adjacent sequences: A095023 A095024 A095025 * A095027 A095028 A095029 KEYWORD nonn,tabl,base AUTHOR Hugo Pfoertner, Jun 02 2004 EXTENSIONS More terms from David Wasserman, Jun 03 2004 STATUS approved

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Last modified May 29 10:46 EDT 2024. Contains 372938 sequences. (Running on oeis4.)