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Search: id:A025721
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A025721 Index of 7^n within sequence of numbers of form 3^i*7^j. +0
1
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; listen)
OFFSET

1,2

CROSSREFS

Sequence in context: A032409 A073896 A077853 this_sequence A102508 A115298 A161206

Adjacent sequences: A025718 A025719 A025720 this_sequence A025722 A025723 A025724

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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