A025670 - OEIS

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A025670

Exponent of 7 (value of i) in n-th number of form 7^i*9^j.

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

Table of n, a(n) for n=1..101.

CROSSREFS

Sequence in context: A025677 A025651 A330238 * A122200 A025646 A025661

Adjacent sequences: A025667 A025668 A025669 * A025671 A025672 A025673

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved