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A018876 a(n)^7 is smallest seventh power beginning with n. 9
0, 1, 3, 12, 9, 34, 13, 5, 7, 37, 10, 38, 2, 28, 76, 55, 4, 15, 21, 11, 8, 3, 58, 42, 22, 114, 16, 6, 116, 84, 117, 44, 85, 119, 23, 12, 167, 45, 234, 63, 88, 17, 33, 46, 89, 24, 173, 9, 174, 65, 47, 91, 34, 127, 66, 92, 128, 248, 48, 129, 67, 18, 13, 181, 35, 351, 131, 49, 183, 95, 255 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

FORMULA

a(n^7) = n for n >= 0. - Seiichi Manyama, Jan 30 2017

EXAMPLE

a(2)=3, because 3^7=2187 is the first 7th power with the most significant digit 2;

a(16)=4, because 4^7=16384 is the first 7th power whose two most significant digits are 16.

CROSSREFS

Cf. A018851 (k=2), A018852 (k=3), A018853 (k=4), A018872 (k=5), A018874 (k=6), this sequence (k=7), A018878 (k=8), A018880 (k=9), A018882 (k=10).

Sequence in context: A165988 A298028 A215842 * A038230 A292581 A207852

Adjacent sequences:  A018873 A018874 A018875 * A018877 A018878 A018879

KEYWORD

nonn,base

AUTHOR

David W. Wilson

EXTENSIONS

Added initial 0. - Seiichi Manyama, Jan 30 2017

STATUS

approved

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Last modified July 4 23:17 EDT 2022. Contains 355086 sequences. (Running on oeis4.)