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.

2, 929, 39293, 3392933, 733929337

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. 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