A112445 - OEIS

A112445

Pseudoprimes (base 2) equal to the product of 7 primes not necessarily distinct.

370851481, 1310486905, 1452092005, 1553860945, 2719940041, 3328293745, 3860623585, 5394826801, 5612626041, 5659475185, 6295936465, 8857509661, 9234602385, 10780911505, 10975165201, 11718888181, 12254138065, 12416553721, 12452890681, 13577445505, 14795826661

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OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

a(1) = 370851481 = 7*11*13*17*19*31*37.

MATHEMATICA

s={}; Do[If[PrimeOmega[n] == 7 && PowerMod[2, n - 1, n] == 1, AppendTo[s, n]], {n, 1, 2*10^9}]; s (* Amiram Eldar, Nov 10 2019 *)

CROSSREFS

Intersection of A046308 and A001567.

Sequence in context: A017471 A017603 A233804 * A101640 A233798 A230528