Numbers with five neighboring primes on the hexagonal spiral board of odd numbers.

Terms

a(0) =1a(1) =15a(2) =45a(3) =63a(4) =165a(5) =195a(6) =231a(7) =459a(8) =693a(9) =909a(10) =969a(11) =1299a(12) =1785a(13) =2709a(14) =3699a(15) =4131a(16) =4449a(17) =5145a(18) =7041a(19) =8541a(20) =10209a(21) =16065a(22) =20355a(23) =22569a(24) =27489a(25) =28299a(26) =38151a(27) =47745a(28) =49365a(29) =49959