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A070922 First 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, 7392937, 373929373 (list; graph; refs; listen; history; text; internal format)
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. 169-176, 1999-2000.

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. A070927.

Sequence in context: A282346 A070967 A070927 * A258586 A176940 A172386

Adjacent sequences:  A070919 A070920 A070921 * A070923 A070924 A070925

KEYWORD

easy,fini,full,nonn,base

AUTHOR

Benoit Cloitre, May 24 2002

STATUS

approved

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Last modified March 20 05:34 EDT 2019. Contains 321344 sequences. (Running on oeis4.)