A018876 a(n)^7 is smallest seventh power beginning with n.

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

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