

A230808


Smallest sets of 3 consecutive odd numbers that are primes or pseudoprime (base 2). The initial odd number is listed.


2



3, 641, 643, 4369, 25759, 33149, 87249, 129917, 157637, 212419, 332947, 451901, 656597, 656599, 831405, 1489665, 1608461, 2113665, 3020357, 3370637, 6212357, 6212359, 19092917, 31880577, 34487597, 38790749, 63560683, 81612105, 84028407, 86559045, 274014885
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS

Shyam Sunder Gupta, Table of n, a(n) for n = 1..5001
Jan Feitsma, Tables of pseudoprimes and related data


EXAMPLE

641 is in sequence because 641, 643, 645 is a set of 3 consecutive odd number where 645 is pseudoprime base 2 and others are prime.


CROSSREFS

Cf. A001567, A230559, A228575, A230668, A230715.
Sequence in context: A229688 A287890 A091261 * A158600 A092301 A229668
Adjacent sequences: A230805 A230806 A230807 * A230809 A230810 A230811


KEYWORD

nonn


AUTHOR

Shyam Sunder Gupta, Oct 30 2013


STATUS

approved



