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A059693 Palindromes n such that 1n1, 3n3, 7n7 and 9n9 are all primes. 3
8179718, 8615168, 209484902, 303272303, 342272243, 354050453, 378707873, 533373335, 631363136, 661525166, 668787866, 792545297, 807989708, 964666469, 12792529721, 14435153441, 17755355771, 20160806102, 20175857102 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 26 20:09 EDT 2020. Contains 337374 sequences. (Running on oeis4.)