A059798 Primes p such that |p - q| is a square, where q is the reversal of p.

23, 37, 43, 59, 67, 73, 89, 1237, 1567, 1787, 1907, 2141, 2251, 2297, 2633, 2963, 3019, 4079, 4253, 4363, 4583, 6637, 6701, 6857, 6967, 7211, 7321, 7541, 8147, 8419, 8923, 8969, 9103, 9323, 9433, 29303, 29803, 40093, 40193, 40493, 40693, 40993

Offset: 1

Author

Enoch Haga, Feb 23 2001

Keywords

• easy
• nonn
• base

Examples

			a(7)=1237. Reverse is 7321 so 7321-1237=6084 and 6084 is a square whose root is 78.
		

Crossrefs

Cf. A059799.

Formula

Subtract reversal of prime from prime. Take absolute value. If a square, add to sequence.