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A059693
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Palindromes n such that 1n1, 3n3, 7n7 and 9n9 are all primes.
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3
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8179718, 8615168, 209484902, 303272303, 342272243, 354050453, 378707873, 533373335, 631363136, 661525166, 668787866, 792545297, 807989708, 964666469, 12792529721, 14435153441, 17755355771, 20160806102, 20175857102
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OFFSET
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1,1
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LINKS
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EXAMPLE
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8179718 is ok because 181797181, 381797183, 781797187 and 981797189 are primes.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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