A085709 a(0)=1; then smallest multiple of n such that a(n) + a(n-1) is a semiprime.

1, 3, 6, 3, 12, 10, 12, 14, 8, 18, 20, 66

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Example

a(12) does not exist, since 66+12k = 2*3*(2k+11) is not a semiprime for any positive k.

Crossrefs

Cf. A001358.

Sequence in context: A336769 A337035 A203491 * A120910 A109044 A205844

Adjacent sequences: A085706 A085707 A085708 * A085710 A085711 A085712

Keyword

fini,full,nonn

Author

Jason Earls and Amarnath Murthy, Jul 19 2003

Extensions

Edited by Dean Hickerson, Jul 19 2003

Status

approved