A008866 Prime(A052928(n+1)) + (-1)^n* prime(A109613(n)).

1, 8, 2, 18, 2, 30, 2, 42, 6, 60, 6, 78, 2, 90, 6, 112, 2, 128, 4, 144, 6, 162, 6, 186, 4, 204, 4, 216, 4, 240, 4, 268, 2, 288, 2, 308, 6, 330, 6, 352, 2, 372, 2, 390, 2, 410, 12, 450, 2, 462, 6, 480, 10, 508, 6, 532

Offset

1,2

References

Problem #1210, Series Formation, by Charles W. Trigg, J. Rec. Math., 15 (1982), 221-222.

Links

Table of n, a(n) for n=1..56.

Maple

ithprime(2*ceil(n/2))+(-1)^n*ithprime(2*floor(n/2)+1);

Crossrefs

Sequence in context: A164587 A050096 A161593 * A180728 A308217 A248297

Adjacent sequences: A008863 A008864 A008865 * A008867 A008868 A008869

Keyword

nonn

Author

N. J. A. Sloane, R. K. Guy

Status

approved