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A018831 Numbers n such that n is a substring of its square in base 7 (written in base 10). 0
0, 1, 7, 30, 49, 285, 343, 911, 1900, 2208, 2401, 13962, 16807, 59763, 64098, 69128, 85880, 97734, 117649, 195032, 418341, 754422, 823543, 2162126, 2629229, 2790841, 3488518, 3842400, 4960401, 5764801, 7923812, 8559490, 15134882, 19765943 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Sequence in context: A053621 A210107 A266604 * A063128 A063148 A116283

Adjacent sequences:  A018828 A018829 A018830 * A018832 A018833 A018834

KEYWORD

nonn,base

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 21 14:54 EDT 2019. Contains 323443 sequences. (Running on oeis4.)