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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A020246 Strong pseudoprimes to base 20. 1 21, 671, 889, 1891, 2059, 2761, 5461, 7999, 13051, 15311, 16441, 21667, 25681, 34861, 37901, 38989, 42127, 49771, 50737, 54811, 64681, 68251, 78961, 85591, 88831, 92509, 93031, 96049, 97921, 105001, 109061, 111361, 114841, 123713, 143009, 145351 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 LINKS R. J. Mathar, Table of n, a(n) for n = 1..208 Index entries for sequences related to pseudoprimes CROSSREFS Sequence in context: A158216 A262960 A341571 * A239099 A006934 A211877 Adjacent sequences: A020243 A020244 A020245 * A020247 A020248 A020249 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified July 18 17:25 EDT 2024. Contains 374388 sequences. (Running on oeis4.)