Problems & Puzzles:
Puzzle 788. P&p(i)^2&RP
Vicente F. Izquierdo sent
the following nice puzzle:
Find the smallest prime P
such that the first k equations are simultaneously prime
Where RP is the
reversible of P. The symbol & means concatenation.
Vicente found the
minimal P for k=6:
are the following prime numbers:
As a mater of fact he found the
minimal P for k=1 to 6:
Q1. Find more
Q2. Show that this sequence is finite or infinite.
Contributions came from Vicente F. Izquierdo, Abhiram R. Devesh and
Emmanuel Vantieghem. They found the next term on the sequence for Q1.
Nobody posted anything about Q2.
"Acabo de encontrar el elemento 7º: 3.259.714.649 para
2,3,5,7,11,13 y 17", May 30, 2015
On June 10, 2015, Hans Havermann wrote:
"Next two terms are 3259714649 and
76526081651." ...Oops. I just refreshed your page and see that
the first one was already submitted. So just 76526081651.
Vicente Felipe Izquierdo wrote on
July 4, 2015:
He subido la secuencia de tu
puzzle 788 a OEIS y he puesto tu referencia.
es la A259744 está
en borrador todavía,