Fermat pseudoprimes to base 2 that are pentagonal.

Terms

a(0) =7957a(1) =241001a(2) =1419607a(3) =1830985a(4) =1993537a(5) =2134277a(6) =2163001a(7) =2491637a(8) =2977217a(9) =4864501a(10) =5351537a(11) =6952037a(12) =10084177a(13) =11367137a(14) =11433301a(15) =14609401a(16) =21306157a(17) =22591301a(18) =26470501a(19) =26977001a(20) =29581501a(21) =35851037a(22) =44731051a(23) =46517857a(24) =53154337a(25) =55318957a(26) =55610837