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A025745 Index of 10^n within sequence of numbers of form 7^i*10^j. 0
1, 3, 6, 10, 15, 21, 29, 38, 48, 59, 71, 85, 100, 116, 133, 151, 170, 191, 213, 236, 260, 285, 312, 340, 369, 399, 430, 462, 496, 531, 567, 604, 642, 682, 723, 765, 808, 852, 897, 944, 992, 1041, 1091, 1142, 1195, 1249, 1304, 1360, 1417, 1475, 1535, 1596, 1658 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..53.

CROSSREFS

Sequence in context: A147846 A062099 A115650 * A175724 A101551 A227430

Adjacent sequences:  A025742 A025743 A025744 * A025746 A025747 A025748

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified August 20 19:51 EDT 2019. Contains 326155 sequences. (Running on oeis4.)