A071067 - OEIS

A071067

First highest palindromic prime pyramid with a(1)=2 such that (number of digits in a(n+1)) = (number of digits in a(n)) + 4.

2, 70207, 357020753, 9635702075369, 33963570207536933, 723396357020753693327, 1272339635702075369332721, 97127233963570207536933272179, 119712723396357020753693327217911, 9011971272339635702075369332721791109, 33901197127233963570207536933272179110933

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

There are 2 such highest "Palindromic prime pyramid" (beginning with 2) with 26 elements.

REFERENCES

G. L. Honaker Jr. and C. Caldwell, Palindromic prime pyramids, J. Recreational Mathematics, vol. 30.3, 1999-2000, pp. 169-176.

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

LINKS

Sean A. Irvine, Table of n, a(n) for n = 1..26

CROSSREFS

Cf. A070927, A070922.