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A080789 Numbers that are primes when turned upside down. 1


%S 11,19,61,68,101,109,110,116,118,161,166,169,181,188,190,199,601,608,

%T 616,619,661,680

%N Numbers that are primes when turned upside down.

%D P. Giannopoulos, The Brainteasers (unpublished)

%Y Cf. A057770, A054047.

%K base,easy,nonn

%O 1,1

%A Giannopoulos P. (pgiannop1(AT)yahoo.com), Mar 12 2003

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Last modified September 22 17:01 EDT 2021. Contains 347607 sequences. (Running on oeis4.)