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A220570 Numbers that are not Brazilian numbers. 10
1, 2, 3, 4, 5, 6, 9, 11, 17, 19, 23, 25, 29, 37, 41, 47, 49, 53, 59, 61, 67, 71, 79, 83, 89, 97, 101, 103, 107, 109, 113, 131, 137, 139, 149, 151, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 223, 227, 229, 233, 239, 251, 257, 263, 269, 271, 277, 281 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

"Nombres brésiliens" in French. There is an infinity of numbers that are not Brazilian numbers. See links: Quadrature (Corollaire 2).

REFERENCES

Pierre Bornsztein, "Hypermath", Vuibert, Exercise a35, page 7.

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

Bernard Schott, Les nombres brésiliens, Quadrature, no. 76, avril-juin 2010, pages 30-38; included here with permission from the editors of Quadrature.

EXAMPLE

25 is a member because it's not possible to write 25=(mm...mm)_b where b is a natural number with 1 < b < 24 and 1 <= m < b.

PROG

(PARI) for(n=1, 300, c=0; for(b=2, n-2, d=digits(n, b); if(vecmin(d)==vecmax(d), c=n; break); c++); if(c==max(n-3, 0), print1(n, ", "))) \\ Derek Orr, Apr 30 2015

CROSSREFS

Cf. A125134, A190300, A220136.

Sequence in context: A102571 A251241 A064278 * A299297 A125155 A091179

Adjacent sequences:  A220567 A220568 A220569 * A220571 A220572 A220573

KEYWORD

nonn,easy

AUTHOR

Bernard Schott, Dec 16 2012

STATUS

approved

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Last modified August 18 22:17 EDT 2018. Contains 313840 sequences. (Running on oeis4.)