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A278816 Numbers that can be produced from their own digits by applying one or more of the eight operations {+, -, *, /, sqrt(), ^, !, concat11()}, with no operation used more than once, where "concat11()" means the operation of concatenating two single digits. 0
0, 1, 2, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Extending the sequence will soon become impractical without a program to check every possible way to apply one or more of the eight operations. - Editors, Dec 03 2016

LINKS

Table of n, a(n) for n=1..78.

Matematico Fresnillense, Reto Matematico Interesante (In Spanish).

EXAMPLE

    0 is a term because      sqrt(0) = 0;

   24 is a term because (2+sqrt(4))! = 24;

   25 is a term because          5^2 = 25;

  343 is a term because      (3+4)^3 = 343.

CROSSREFS

Sequence in context: A299982 A089601 A171893 * A043072 A165451 A121717

Adjacent sequences:  A278813 A278814 A278815 * A278817 A278818 A278819

KEYWORD

nonn,base

AUTHOR

José de Jesús Camacho Medina, Nov 28 2016

STATUS

approved

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Last modified November 18 12:35 EST 2019. Contains 329261 sequences. (Running on oeis4.)