A083988 Primes p such that concatenation p, 0, R(p) is also a prime (of course a palindromic prime).

31, 73, 139, 149, 163, 167, 173, 193, 197, 331, 347, 359, 367, 397, 719, 769, 911, 947, 967, 977, 1033, 1039, 1069, 1087, 1091, 1109, 1171, 1279, 1427, 1433, 1447, 1487, 1499, 1543, 1567, 1571, 1601, 1607, 1627, 1709, 1759, 1777, 1801, 1861, 1871, 1879

Offset

1,1

Comments

Concatenation p and R(p) is a composite number (a multiple of 11).

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

31 is a member as 31013 is also prime.
139 is a member as 1390931 is also a prime.

Mathematica

Select[Prime[Range[300]], PrimeQ[FromDigits[Join[IntegerDigits[#], {0}, Reverse[ IntegerDigits[ #]]]]]&] (* Harvey P. Dale, Oct 03 2022 *)

Crossrefs

Sequence in context: A291554 A084655 A384227 * A070954 A141892 A298613

Adjacent sequences: A083985 A083986 A083987 * A083989 A083990 A083991

Keyword

base,nonn

Author

Amarnath Murthy, May 22 2003

Extensions

More terms from David Wasserman, Dec 07 2004

Status

approved