Composite numbers k such that D(k) == 3 (mod k), where D(k) is the k-th central Delannoy number (A001850).

A330203

Composite numbers k such that D(k) == 3 (mod k), where D(k) is the k-th central Delannoy number (A001850).

Terms

    a(0) =10a(1) =15a(2) =50a(3) =370a(4) =2418a(5) =4371a(6) =5341a(7) =8430a(8) =20535a(9) =25338a(10) =26958a(11) =278674a(12) =1194649a(13) =4304445a(14) =11984885a(15) =12327121a(16) =20746461a(17) =27585010a(18) =72363853a(19) =79501818

External references