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A025721 Index of 7^n within sequence of numbers of form 3^i*7^j. 0
1, 3, 7, 13, 21, 30, 41, 54, 69, 85, 103, 123, 145, 169, 194, 221, 250, 281, 313, 347, 383, 421, 460, 501, 544, 589, 636, 684, 734, 786, 840, 895, 952, 1011, 1072, 1134, 1198, 1264, 1332, 1402, 1473, 1546, 1621, 1698, 1776, 1856, 1938, 2022, 2108, 2195, 2284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..51.

CROSSREFS

Sequence in context: A299476 A077853 A256588 * A298267 A235532 A195020

Adjacent sequences:  A025718 A025719 A025720 * A025722 A025723 A025724

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified April 7 11:04 EDT 2020. Contains 333301 sequences. (Running on oeis4.)