A115377 Numbers n such that the first n digits of sqrt(2) form a prime.

55, 97, 225, 11260, 11540

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