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A045574 Numbers that are still numbers when turned upside down (uses only digits 0, 1, 6, 8, 9 with no final 0's). 12

%I #16 Jan 06 2023 19:27:20

%S 0,1,6,8,9,11,16,18,19,61,66,68,69,81,86,88,89,91,96,98,99,101,106,

%T 108,109,111,116,118,119,161,166,168,169,181,186,188,189,191,196,198,

%U 199,601,606,608,609,611,616,618,619,661,666,668,669,681,686,688,689,691,696,698,699

%N Numbers that are still numbers when turned upside down (uses only digits 0, 1, 6, 8, 9 with no final 0's).

%C "No final 0's" means that the rotated number should not have leading zeros; the single digit of the number 0 itself is not considered as such.

%H Michel Marcus, <a href="/A045574/b045574.txt">Table of n, a(n) for n = 1..2501</a>

%H <a href="/index/Fi#final">Index entries for sequences related to final digits of numbers</a>

%o (PARI) is_A045574(n)=n%10 & !setminus(Set(Vec(Str(n))),Vec("01689")) || !n \\ _M. F. Hasler_, May 04 2012

%Y Cf. A000787, A018847, A054047, A057770.

%K base,easy,nonn

%O 1,3

%A _Erich Friedman_

%E More terms from _Michel Marcus_, Dec 27 2020

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Last modified April 25 10:34 EDT 2024. Contains 371967 sequences. (Running on oeis4.)