A025649 - OEIS

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A025649

Exponent of 4 (value of i) in n-th number of form 4^i*10^j.

0, 1, 0, 2, 1, 3, 0, 2, 4, 1, 3, 0, 5, 2, 4, 1, 6, 3, 0, 5, 2, 7, 4, 1, 6, 3, 8, 0, 5, 2, 7, 4, 9, 1, 6, 3, 8, 0, 5, 10, 2, 7, 4, 9, 1, 6, 11, 3, 8, 0, 5, 10, 2, 7, 12, 4, 9, 1, 6, 11, 3, 8, 13, 0, 5, 10, 2, 7, 12, 4, 9, 14, 1, 6, 11, 3, 8, 13, 0, 5, 10, 15, 2, 7, 12, 4, 9, 14, 1, 6, 11, 16, 3, 8, 13, 0, 5, 10

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..98.

CROSSREFS

Differs from A025641 at a(114). A025686 is exponent of 10.

Sequence in context: A022328 A215344 A025641 * A025642 A025643 A127478

Adjacent sequences: A025646 A025647 A025648 * A025650 A025651 A025652

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved