Values of A023900 which occur only at indices which are powers of a prime.

Terms

a(0) =-1a(1) =-2a(2) =-4a(3) =-6a(4) =-10a(5) =-16a(6) =-18a(7) =-22a(8) =-28a(9) =-30a(10) =-42a(11) =-46a(12) =-52a(13) =-58a(14) =-66a(15) =-70a(16) =-78a(17) =-82a(18) =-100a(19) =-102a(20) =-106a(21) =-126a(22) =-130a(23) =-136a(24) =-138a(25) =-148a(26) =-150a(27) =-162a(28) =-166a(29) =-172