login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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. 0
2, 70207, 357020753, 9635702075369, 33963570207536933, 723396357020753693327, 1272339635702075369332721, 97127233963570207536933272179, 119712723396357020753693327217911 (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

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

CROSSREFS

Cf. A070927, A070922.

Sequence in context: A272137 A272248 A195003 * A060069 A231612 A170995

Adjacent sequences:  A071064 A071065 A071066 * A071068 A071069 A071070

KEYWORD

fini,nonn,base

AUTHOR

Benoit Cloitre, May 26 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 8 04:27 EST 2016. Contains 278902 sequences.