A049307 Numbers k such that k is a substring of 9^k.

5, 7, 9, 25, 26, 31, 37, 43, 46, 47, 48, 53, 59, 60, 61, 63, 68, 69, 70, 72, 74, 76, 80, 85, 87, 88, 89, 91, 94, 97, 101, 104, 107, 124, 132, 135, 140, 148, 158, 166, 170, 180, 187, 190, 199, 209, 211, 215, 231, 243, 244, 256, 266, 270, 271, 279, 283, 288, 289, 291

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[300], SequenceCount[IntegerDigits[9^#], IntegerDigits[#]]>0&] (* Harvey P. Dale, Jan 24 2026 *)

Crossrefs

Cf. A032740, A049301, A049302, A049303, A049304, A049305, A049306.

Sequence in context: A268410 A391685 A029650 * A050113 A050888 A366312

Adjacent sequences: A049304 A049305 A049306 * A049308 A049309 A049310

Keyword

nonn,base,easy

Author

David W. Wilson

Status

approved