

A230810


Smallest of 3 consecutive odd numbers that are primes or strong pseudoprime to base 2.


2




OFFSET

1,1


COMMENTS

Since a(7) = a(6) + 2, the number a(6) = 1640293473202755797 actually starts a sequence of four consecutive odd numbers which are prime or strong pseudoprimes to base 2.  M. F. Hasler, Dec 08 2016


LINKS



EXAMPLE

3465253618399 is in sequence because 3465253618399, 3465253618401, 3465253618403 is a set of 3 consecutive odd number where 3465253618401 is strong pseudoprime base 2 and others are prime.


CROSSREFS



KEYWORD

nonn,hard,more


AUTHOR



EXTENSIONS



STATUS

approved



