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 A025646 Exponent of 4 (value of i) in n-th number of form 4^i*5^j. 1
 0, 1, 0, 2, 1, 0, 3, 2, 1, 0, 4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 8, 0, 7, 6, 5, 4, 3, 2, 9, 1, 8, 0, 7, 6, 5, 4, 3, 10, 2, 9, 1, 8, 0, 7, 6, 5, 4, 11, 3, 10, 2, 9, 1, 8, 0, 7, 6, 5, 12, 4, 11, 3, 10, 2, 9, 1, 8, 0, 7, 6, 13, 5, 12, 4, 11, 3, 10, 2, 9, 1, 8, 0, 7, 14, 6, 13 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS MATHEMATICA With[{nn=15}, IntegerExponent[#, 4]&/@Union[Flatten[Table[4^x 5^y, {x, 0, nn}, {y, 0, nn}]]]] (* Harvey P. Dale, May 10 2019 *) CROSSREFS Cf. A025617. Differs from A025661 at a(1881). Sequence in context: A330238 A025670 A122200 * A025661 A025671 A025652 Adjacent sequences: A025643 A025644 A025645 * A025647 A025648 A025649 KEYWORD nonn AUTHOR STATUS approved

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Last modified March 31 05:57 EDT 2023. Contains 361634 sequences. (Running on oeis4.)