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

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

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A070927, A070922.

Sequence in context: A272137 A272248 A195003 * A321246 A371645 A060069

Adjacent sequences: A071064 A071065 A071066 * A071068 A071069 A071070

Keyword

fini,nonn,base

Author

Benoit Cloitre, May 26 2002

Status

approved