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 A080464 Product of the two numbers formed by alternate digits of n. 7
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 0, 7, 14, 21, 28, 35, 42, 49, 56, 63, 0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 10,3 LINKS M. F. Hasler, Table of n, a(n) for n = 10..10000 FORMULA a(n) < n for all n. - M. F. Hasler, Jan 10 2016 EXAMPLE a(132546) = 124 * 356 = 44144. MATHEMATICA nad[n_]:=Module[{idn=IntegerDigits[n]}, FromDigits[Take[idn, {1, -1, 2}]] FromDigits[ Take[idn, {2, -1, 2}]]]; Array[nad, 120, 10] (* Harvey P. Dale, Aug 07 2019 *) PROG (PARI) A080464(n, d=digits(n))={n=d*matrix(#d, 2, z, s, if((z-s)%2, 10^((#d-z)\2))); n[1]*n[2]} CROSSREFS Cf. A007954, A080463, A080465, A087471, A087472, A087473, A087474. Sequence in context: A088118 A330633 A257850 * A171765 A257297 A035930 Adjacent sequences: A080461 A080462 A080463 * A080465 A080466 A080467 KEYWORD base,easy,nonn,look AUTHOR Amarnath Murthy, Mar 02 2003 EXTENSIONS More terms from Ray Chandler, Oct 11 2003 STATUS approved

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Last modified June 5 12:45 EDT 2023. Contains 363136 sequences. (Running on oeis4.)