Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
R. J. Mathar, Table of n, a(n) for n = 1..229
Eric Weisstein's World of Mathematics, Strong Pseudoprime
Index entries for sequences related to pseudoprimes
Cf. A001262 (base 2), A020229 (base 3).
Sequence in context: A050217 A214305 A086837 * A087716 A084653 A143688
Adjacent sequences: A020227 A020228 A020229 * A020231 A020232 A020233
David W. Wilson