Table of n, a(n) for n=1..5.
232564 is an SPN but is not primitive since it can be obtained from the SPN 32564 by prefixing the digit 2.
Cf. A134698, A134947.
Sequence in context: A028240 A251000 A134698 * A134947 A172700 A101744
Adjacent sequences: A134946 A134947 A134948 * A134950 A134951 A134952
M. F. Hasler, Feb 02 2008