A025648 - OEIS

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A025648

Exponent of 4 (value of i) in n-th number of form 4^i*7^j.

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

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..99.

CROSSREFS

Sequence in context: A244215 A255325 A025654 * A025655 A022336 A019586

Adjacent sequences: A025645 A025646 A025647 * A025649 A025650 A025651

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved