A018859 Smallest power of 4 that begins with n.

1, 256, 302231454903657293676544, 4, 5070602400912917605986812821504, 64, 70368744177664, 81129638414606681695789005144064, 91343852333181432387730302044767688728495783936, 1024, 1125899906842624

Offset

1,2

Links

Seiichi Manyama, Table of n, a(n) for n = 1..490

Formula

a(n) = 4^A018860(n). - Michel Marcus, Feb 24 2016

a(4^n) = 4^n for n >= 0. - Seiichi Manyama, Jan 29 2017

Crossrefs

Cf. A018802 (k=2), A018857 (k=3), this sequence (k=4), A018861 (k=5), A018863 (k=6), A018865 (k=7), A018867 (k=8), A018869 (k=9).

Sequence in context: A255321 A228133 A139304 * A180699 A195529 A004217

Adjacent sequences: A018856 A018857 A018858 * A018860 A018861 A018862

Keyword

nonn,base

Author

David W. Wilson

Status

approved