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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

Table of n, a(n) for n=1..5.

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

Adjacent sequences: A115374 A115375 A115376 * A115378 A115379 A115380

KEYWORD

nonn,base,more

AUTHOR

Eric W. Weisstein, Jan 21 2006

STATUS

approved

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Last modified December 5 17:04 EST 2022. Contains 358588 sequences. (Running on oeis4.)