Squarefree numbers (A005117) of the form p*q*r with prime factors p, q, r with q = 2*p + 1 and r = 2*q + 1.
A231967
Squarefree numbers (A005117) of the form p*q*r with prime factors p, q, r with q = 2*p + 1 and r = 2*q + 1.
Terms
- a(0) =110a(1) =1265a(2) =11891a(3) =568301a(4) =5719229a(5) =46203659a(6) =371436119a(7) =1057570169a(8) =2978731439a(9) =8475105539a(10) =8777935031a(11) =14865764009a(12) =22397944469a(13) =24460553171a(14) =26008879181a(15) =27621202391a(16) =47549400491a(17) =53960155829a(18) =54994829321a(19) =57639193331a(20) =119010782819a(21) =157361958899
External references
- oeis: A231967