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A219346
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Pseudoprimes to base 2 that are divisible by the squares of at least two primes.
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5
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4578627124156945861, 57406119388190085241, 71879404939979986441, 98654983210791303661, 109509947374633729561, 153653468307592928221, 213717603347521018201, 541537521095562280381, 608114634633795825901, 721729926215346550321, 1062575800959998723581
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OFFSET
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1,1
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COMMENTS
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2-pseudoprimes of the form n*p^2*q^2, where p and q are distinct Wieferich primes (A001220).
Unless there are other Wieferich primes besides 1093 and 3511, the sequence is the intersection of A247830 and A247831. - Max Alekseyev, Nov 26 2017
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LINKS
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PROG
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(PARI) forstep(n=236641458619975501, 4.489e31, 723664277589495060, if(Mod(2, n)^(n-1)==1, print1(n", ")))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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