A043515 -id:A043515 - cp's OEIS frontend

A051003 Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion.

666, 1666, 2666, 3666, 4666, 5666, 6660, 6661, 6662, 6663, 6664, 6665, 6666, 6667, 6668, 6669, 7666, 8666, 9666, 10666, 11666, 12666, 13666, 14666, 15666, 16660, 16661, 16662, 16663, 16664, 16665, 16666, 16667, 16668, 16669, 17666, 18666

Offset: 1

Eric W. Weisstein

Jens Kruse Andersen, Table of n, a(n) for n = 1..1000
Tony Padilla and Brady Haran, The Most Evil Number, Numberphile video (2018)
Eric Weisstein's World of Mathematics, Beast Number

Cf. A131645, A057564, A002282, A138563, A043515, A046720, A186086.

Select[Range[18666], ! StringFreeQ[ToString[#], "666"] &] (* Arkadiusz Wesolowski, Sep 08 2011 *)

A316867 Number of times 6 appears in decimal expansion of n.

Original entry on oeis.org

0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 0

Robert G. Wilson v, Jul 15 2018

			a(0) = 0 since the decimal representation of 0 does not contain the digit 6.
a(6) = 1 since 6 appears once in the decimal expansion of 6.

Cf. A043513, A043514, A043515, A043516.

Cf. A055641, A268643, A316863, A316864, A316865, A316866, A316868, A316869, A102683.

Mathematica
```
Array[ DigitCount[#, 10, 6] &, 105, 0]
```

a(n) = #select(x->x==6, digits(n)); \\ Michel Marcus, Jul 20 2018

cp's OEIS Frontend

A051003 Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion.

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