A052155 - OEIS

A052155

Pseudoprimes to both base 2 and base 3, i.e., intersection of A001567 and A005935.

1105, 1729, 2465, 2701, 2821, 6601, 8911, 10585, 15841, 18721, 29341, 31621, 41041, 46657, 49141, 52633, 63973, 75361, 83333, 83665, 88561, 90751, 93961, 101101, 104653, 107185, 115921, 126217, 162401, 172081, 176149, 188461

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OFFSET

1,1

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 (first 201 terms from R. J. Mathar)

J. Bernheiden, Pseudoprimes (Text in German)

Index entries for sequences related to pseudoprimes

MATHEMATICA

Select[ Range[228240], !PrimeQ[ # ] && PowerMod[2, # - 1, # ] == 1 && PowerMod[3, # - 1, # ] == 1 &]

PROG

(PARI) is(n)=!isprime(n)&&Mod(2, n)^(n-1)==1&&Mod(3, n)^(n-1)==1 \\ Charles R Greathouse IV, Apr 12 2012

CROSSREFS

Cf. A001567, A005935, A083737.

Sequence in context: A025314 A025287 A025305 * A097102 A281877 A159781

Adjacent sequences: A052152 A052153 A052154 * A052156 A052157 A052158

KEYWORD

nice,nonn

AUTHOR

Harvey P. Dale, Jan 24 2000

STATUS

approved