Positions of hexagonal pyramidal numbers in the EKG sequence.

Terms

a(0) =1a(1) =14a(2) =19a(3) =46a(4) =85a(5) =155a(6) =233a(7) =350a(8) =494a(9) =659a(10) =878a(11) =1163a(12) =1460a(13) =1828a(14) =2260a(15) =2726a(16) =3271a(17) =3873a(18) =4564a(19) =5321a(20) =6151a(21) =7032a(22) =8044a(23) =9151a(24) =10337a(25) =11636a(26) =13010a(27) =14504a(28) =16111a(29) =17789