[grubles]

Primecoin (sign: Ψ; code: XPM) is a peer-to-peer open source cryptocurrency that implements a unique scientific computing proof-of-work system. Primecoin's proof-of-work system searches for chains of prime numbers.

https://en.wikipedia.org/wiki/Primecoin

[akvadrako]

Primecoin is dead - go to their website and click on "Forums". Or find the network node explorer online.

[grubles]

Looks like it's very much alive: http://xpm.muuttuja.org/charts/

[taberiand]

Is or was? My (admittedly brief) look into this suggests it's dead or dying

[alexcnwy]

It's up 105% this week so someone thinks it's still alive.