A134949 Primitive self-power numbers (or SPN's): terms in A134698 which cannot be obtained by taking an earlier term M (say) of A134698 and prefixing, inserting or suffixing a digit of M.
32564, 256432, 325648, 643256, 832564
Offset: 1
Examples
232564 is an SPN but is not primitive since it can be obtained from the SPN 32564 by prefixing the digit 2.