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A070927
Second palindromic prime pyramids with a(1)=2 such that (number of digits in a(n+1)) = (number of digits in a(n)) + 2.
3
2, 929, 39293, 3392933, 733929337
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OFFSET
1,1
COMMENTS
There are only 2 palindromic prime pyramids beginning with 2 (each one is finite with 5 elements).
REFERENCES
G. L. Honaker Jr. and C. Caldwell, Palindromic prime pyramids, J. Recreational Mathematics, vol. 30.3, pp. 169176, 19992000.
J.P. Delahaye, "Pour la science", (French edition of Scientific American), Juin 2002, p. 99.
LINKS
Table of n, a(n) for n=1..5.
CROSSREFS
Cf.
A070922
.
Sequence in context:
A159723
A282346
A070967
*
A070922
A332192
A258586
Adjacent sequences:
A070924
A070925
A070926
*
A070928
A070929
A070930
KEYWORD
easy
,
fini
,
full
,
nonn
,
base
AUTHOR
Benoit Cloitre
, May 24 2002
STATUS
approved
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Last modified July 13 22:24 EDT 2024. Contains 374288 sequences. (Running on oeis4.)