A256622 Primes p such that the decimal expansion of p remains prime under four iterations of base-10 to base-2 conversion.

9632552297, 23971039429, 32460766253, 55325366053, 75883883641, 87824771197, 91754975491, 91989527023, 97696323983

Offset

1,1

Comments

Jim Fougeron and Farideh Firoozbakht independently found the first term 9632552297.

When does five iterations start?

Links

Table of n, a(n) for n=1..9.

Carlos Rivera, Puzzle 280, The Prime Puzzles & Problems Connection.

Crossrefs

Cf. A065720, A123266, A256621.

Sequence in context: A225143 A130428 A354716 * A359344 A022251 A015385

Adjacent sequences: A256619 A256620 A256621 * A256623 A256624 A256625

Keyword

nonn,base,hard,more

Author

Sebastian Petzelberger, Apr 07 2015

Status

approved