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

Author

David W. Wilson

Keywords

• nonn
• base

Examples

			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.
		

Links

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

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).

Formula

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

Extensions

Added initial 0. - Seiichi Manyama, Jan 30 2017