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%I #10 Feb 12 2019 14:58:45
%S 55,97,225,11260,11540
%N Numbers n such that the first n digits of sqrt(2) form a prime.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PythagorassConstantDigits.html">Pythagoras's Constant Digits</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a>
%e First Pythagorean prime is 1414213562373095048801688724209698078569671875376948073, which has 55 digits.
%Y Cf. A002193.
%K nonn,base,more
%O 1,1
%A _Eric W. Weisstein_, Jan 21 2006
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