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

1,1

Links

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

Example

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

Crossrefs

Cf. A059677, A032682, A059694.

Sequence in context: A183020 A015391 A277580 * A083629 A116304 A116337

Adjacent sequences: A059690 A059691 A059692 * A059694 A059695 A059696

Keyword

nonn,base

Author

Patrick De Geest, Feb 07 2001

Status

approved