A088712 Primes which when concatenated with the previous prime form a new prime.

5, 53, 59, 67, 137, 179, 211, 223, 239, 263, 359, 541, 593, 613, 631, 653, 659, 757, 809, 977, 997, 1009, 1109, 1129, 1237, 1399, 1559, 1783, 1931, 1979, 1993, 2309, 2339, 2347, 2411, 2683, 2879, 3061, 3203, 3271, 3613, 3643, 3767, 4001

Offset

1,1

Links

Table of n, a(n) for n=1..44.

Formula

If isprime(p(n) & p(n-1)) then sequence.add(p(n))

Example

a(2) = 53 because 53 concatenated with the preceding prime (47) yields 5347 which is also prime.

Crossrefs

Cf. A088784.

Sequence in context: A216459 A107803 A255579 * A257667 A045711 A090153

Adjacent sequences: A088709 A088710 A088711 * A088713 A088714 A088715

Keyword

base,nonn

Author

Chuck Seggelin (barkeep(AT)plasteredDragon.com), Oct 15 2003

Status

approved