A059693 - OEIS

%I #9 Nov 06 2015 02:00:49

%S 8179718,8615168,209484902,303272303,342272243,354050453,378707873,

%T 533373335,631363136,661525166,668787866,792545297,807989708,

%U 964666469,12792529721,14435153441,17755355771,20160806102,20175857102

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

%H Chai Wah Wu, <a href="/A059693/b059693.txt">Table of n, a(n) for n = 1..2878</a>

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

%Y Cf. A059677, A032682, A059694.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Feb 07 2001