login
A141457
Primes of the form (3*x*y-y-6)/(3*x+1), where x=prime and y=composite.
0
61, 73, 181, 241, 421, 433, 577, 601, 829, 997, 1033, 1069, 1153, 1621, 1657, 1753, 1861, 2017, 2089, 2113, 2521, 2593, 2917, 3049, 3121, 3373, 3517, 3637, 3709, 3967, 4093, 4201, 4357, 4561, 4861, 5119, 5179, 5323, 5443, 5623
OFFSET
1,1
EXAMPLE
If x=11 and y=65, then (3*11*65-65-6)/(3*11+1)=2074/34=61=a(1).
If x=13 and y=77, then (3*13*77-77-6)/(3*13+1)=2820/40=73=a(2).
If x=31 and y=185, then (3*31*185-185-6)/(3*31+1)=17014/94=181=a(3).
If x=41 and y=245, then (3*41*245-245-6)/(3*41+1)=29884/124=241=a(4).
If x=71 and y=425, then (3*71*425-425-6)/(3*71+1)=90094/214=421=a(5).
If x=73 and y=437, then (3*73*437-437-6)/(3*73+1)=95260/220=433=a(6),
etc.
CROSSREFS
Sequence in context: A227520 A033236 A260808 * A112998 A339778 A328160
KEYWORD
nonn
AUTHOR
STATUS
approved