Noncomposite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.

A168025

Noncomposite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.

Terms

    a(0) =1a(1) =19a(2) =151a(3) =1621a(4) =2731a(5) =3631a(6) =4129a(7) =7789a(8) =11719a(9) =12601a(10) =14461a(11) =15439a(12) =17491a(13) =20809a(14) =28309a(15) =29671a(16) =32491a(17) =41719a(18) =59659a(19) =69829a(20) =78541a(21) =83089a(22) =85411a(23) =92569a(24) =97501a(25) =115771a(26) =132679a(27) =138571

External references