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Take a standard 6-sided die and concatenate the numbers that can be seen around any of the corners and sort into increasing order.
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%I #13 Mar 21 2021 16:25:05

%S 123,124,132,135,142,145,153,154,213,214,231,236,241,246,263,264,312,

%T 315,321,326,351,356,362,365,412,415,421,426,451,456,462,465,513,514,

%U 531,536,541,546,563,564,623,624,632,635,642,645,653,654

%N Take a standard 6-sided die and concatenate the numbers that can be seen around any of the corners and sort into increasing order.

%C These are the three-digit numbers that can be read from the simultaneously visible faces that share the same corner on a 6-sided die with a traditional layout (in which the number of pips of opposite sides add up to 7).

%C 3-digit numbers such that the digits are distinct and in 1..6, no two digits add up to 7. - _Jianing Song_, Mar 21 2021

%F a(n) + a(49-n) = 777 for n = 1..48. - _Rémy Sigrist_, Feb 26 2021

%K nonn,base,fini,full

%O 1,1

%A _Halfdan Skjerning_, Feb 25 2021