A253177 - OEIS

A253177

Numbers which can be expressed with fewer 1s using +, -, and * than with + and *.

23, 47, 53, 59, 69, 71, 89, 94, 106, 107, 134, 141, 142, 143, 159, 161, 167, 177, 178, 179, 188, 191, 207, 212, 213, 214, 215, 227, 233, 239, 242, 251, 263, 265, 267, 268, 269, 282, 283, 284, 286, 287, 299, 311, 317, 318, 319, 321

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Numbers n such that A005245(n) > A091333(n). Is it true that a(n) ~ n?

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..3128

Index to sequences related to the complexity of n

EXAMPLE

23 = 2*3*4 - 1 = 3*(2*3 + 1) + 2 can be written with 10 1s using subtraction but requires 11 without, hence 23 is a member. Here the digits 2, 3, and 4 are used for clarity, but could be expanded to (1+1), (1+1+1), etc.

CROSSREFS

Cf. A091333, A005520, A005245, A173419, A255641.

Sequence in context: A358684 A344133 A103629 * A109996 A188833 A121762

Adjacent sequences: A253174 A253175 A253176 * A253178 A253179 A253180

KEYWORD

nonn

AUTHOR

Charles R Greathouse IV, Mar 23 2015

STATUS

approved