Index of first occurrence of 2n in A031883, or 0 if 2n never occurs in A031883 = first differences of lucky numbers A000959.

A181558

Index of first occurrence of 2n in A031883, or 0 if 2n never occurs in A031883 = first differences of lucky numbers A000959.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =20a(4) =31a(5) =14a(6) =126a(7) =85a(8) =36a(9) =145a(10) =140a(11) =122a(12) =376a(13) =231a(14) =162a(15) =483a(16) =692a(17) =600a(18) =993a(19) =1188a(20) =1106a(21) =2440a(22) =1080a(23) =2814a(24) =2586a(25) =450a(26) =2696a(27) =3473a(28) =4254a(29) =4857

External references