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A115377 Numbers n such that the first n digits of sqrt(2) form a prime. 2
55, 97, 225, 11260, 11540 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Constant Primes
Eric Weisstein's World of Mathematics, Pythagoras's Constant Digits
Eric Weisstein's World of Mathematics, Integer Sequence Primes
EXAMPLE
First Pythagorean prime is 1414213562373095048801688724209698078569671875376948073, which has 55 digits.
CROSSREFS
Cf. A002193.
Sequence in context: A128880 A039596 A013543 * A146145 A044144 A044525
KEYWORD
nonn,base,more
AUTHOR
Eric W. Weisstein, Jan 21 2006
STATUS
approved

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Last modified July 22 00:58 EDT 2024. Contains 374478 sequences. (Running on oeis4.)