A059693 Palindromes n such that 1n1, 3n3, 7n7 and 9n9 are all primes.

8179718, 8615168, 209484902, 303272303, 342272243, 354050453, 378707873, 533373335, 631363136, 661525166, 668787866, 792545297, 807989708, 964666469, 12792529721, 14435153441, 17755355771, 20160806102, 20175857102

Offset: 1

Author

Patrick De Geest, Feb 07 2001

Keywords

• nonn
• base

Examples

			8179718 is ok because 181797181, 381797183, 781797187 and 981797189 are primes.
		

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..2878

Crossrefs

Cf. A059677, A032682, A059694.