A070922 - OEIS

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.

2, 929, 39293, 7392937, 373929373

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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. 169-176, 1999-2000.

J.-P. Delahaye, "Pour la science", (French edition of Scientific American), Juin 2002, p. 99.

LINKS

CROSSREFS

KEYWORD

easy,fini,full,nonn,base

AUTHOR

STATUS

approved