OFFSET
0,2
COMMENTS
This is not really well-defined, but it is a published sequence of some recreational interest.
REFERENCES
C. K. Caldwell and A. Rupinski, Pyramids of 3-powerful primes, Mathematical Spectrum, 43 (No. 2, 2010/2011), 65-69.
LINKS
C. K. Caldwell and A. Rupinski, Pyramids of 3-powerful primes (abstract), Mathematical Spectrum, 43 (No. 2, 2010/2011), 65-69.
EXAMPLE
(1)
13
139
12739
1281739
1281739243
1281737299243
12817372218799243
128173765612218799243
12196838173765612218799243
1219683817376590495612218799243
1219683817714717376590495612218799243
1219683853144117714717376590495612218799243
12196838531441159432317714717376590495612218799243
121968385314411594323177147478296917376590495612218799243
CROSSREFS
KEYWORD
base,nonn,fini,full
AUTHOR
N. J. A. Sloane, Feb 22 2011
STATUS
approved