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Search: id:A056915
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| 25326001, 161304001, 960946321, 1157839381, 3215031751, 3697278427, 5764643587, 6770862367, 14386156093, 15579919981, 18459366157, 19887974881, 21276028621
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OFFSET
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1,1
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COMMENT
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These first 13 numbers are the only ones less than 25*10^9 which are simultaneously strong pseudoprimes to bases 2, 3 and 5. Taken from the same table - which indicates (only) whether they are also strong pseudoprime (spsp) or pseudoprime (psp) to base 7, 11 and/or 13: 161304001 is spsp to 11; 3215031751 is spsp to base 7 and is psp to both bases 11 and 13; 5764643587 is spsp to base 13; 14386156093 is psp to bases 7, 11 and 13. 15579919981 is psp to base 7 and spsp to base 11; 19887974881 is psp to base 7; and 21276028621 is psp to bases 11 and 13.
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REFERENCES
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Pomerance, C., Selfridge, J.L. and Wagstaff, Jr., S.S. The pseudoprimes to 25.10^9. Math. Comp., 35, 1980, pp. 1003-1026.
P. Ribenboim, The Little Book of Big Primes. Springer-Verlag, NY, 1991, pp. 82-83.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to pseudoprimes
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CROSSREFS
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Cf. A001262, A020229, A020231.
Adjacent sequences: A056912 A056913 A056914 this_sequence A056916 A056917 A056918
Sequence in context: A115533 A083636 A124069 this_sequence A112130 A120702 A113026
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KEYWORD
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nice,nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 12 2002
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