A025642 - OEIS

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A025642

Exponent of 3 (value of i) in n-th number of form 3^i*7^j.

0, 1, 0, 2, 1, 3, 0, 2, 4, 1, 3, 5, 0, 2, 4, 6, 1, 3, 5, 7, 0, 2, 4, 6, 8, 1, 3, 5, 7, 0, 9, 2, 4, 6, 8, 1, 10, 3, 5, 7, 0, 9, 2, 11, 4, 6, 8, 1, 10, 3, 12, 5, 7, 0, 9, 2, 11, 4, 13, 6, 8, 1, 10, 3, 12, 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, 5, 14, 7, 0, 16, 9, 2, 11, 4, 13, 6, 15, 8, 1, 17, 10

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..97.

CROSSREFS

Sequence in context: A215344 A025641 A025649 * A025643 A127478 A127472

Adjacent sequences: A025639 A025640 A025641 * A025643 A025644 A025645

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved