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A055552 Number of base-2 strong pseudoprimes (A001262) less than 10^n. 3
0, 0, 0, 5, 16, 46, 162, 488, 1282, 3291, 8607, 22407, 58892, 156251, 419489, 1135860, 3115246, 8646507, 24220195 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..19.

William Galway, Tables of pseudoprimes and related data.

Eric Weisstein's World of Mathematics, Pseudoprime

Eric Weisstein's World of Mathematics, Strong Pseudoprime

Index entries for sequences related to pseudoprimes

CROSSREFS

Cf. A001262.

Sequence in context: A275126 A071101 A110580 * A086750 A086749 A194541

Adjacent sequences:  A055549 A055550 A055551 * A055553 A055554 A055555

KEYWORD

nonn,hard

AUTHOR

Eric W. Weisstein

EXTENSIONS

Corrected by Shyam Sunder Gupta, Mar 04 2002

a(14)-a(15) from Charles R Greathouse IV, Aug 15 2006

a(16)-a(19) from Charles R Greathouse IV, Mar 14, 2011

STATUS

approved

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Last modified February 25 07:33 EST 2020. Contains 332221 sequences. (Running on oeis4.)