A134811 Giza primes.

2, 3, 5, 7, 787, 34543, 345676543, 34567876543

Offset

1,1

Comments

Giza numbers (A134810) that are prime numbers. For n > 4 the structure of digits represents a pyramid at Giza. Also the top of a mountain. This sequence has only these 8 terms in base 10. For more information, see A134810.

References

Chris K. Caldwell and G. L. Honaker, Jr; Prime Curios!, The Dictionary of Prime Number Trivia, CreateSpace (2009), p. 209.

Links

Table of n, a(n) for n=1..8.

G. L. Honaker, Jr. and Chris K. Caldwell, Prime Curios! 34567876543

Formula

A000040 INTERSECT A134810. - Omar E. Pol, Mar 25 2011

Example

Illustration using the final term of this sequence:
  . . . . . . . . . . .
  . . . . . 8 . . . . .
  . . . . 7 . 7 . . . .
  . . . 6 . . . 6 . . .
  . . 5 . . . . . 5 . .
  . 4 . . . . . . . 4 .
  3 . . . . . . . . . 3
  . . . . . . . . . . .
  . . . . . . . . . . .
  . . . . . . . . . . .

Mathematica

ups = Flatten[Table[Range[i, j - 1], {i, 1, 9}, {j, i + 1, 10}], 1]; afull = Sort[  Map[ToExpression@StringJoin@Map[ToString, #[[;; -2]] ~Join~ Reverse[#]] &, ups]]; Select[afull, PrimeQ] (* James C. McMahon, Apr 11 2025 *)

Crossrefs

Cf. A000040, A048398, A046479, A134810.

Sequence in context: A090720 A114780 A241681 * A046479 A109208 A050665

Adjacent sequences: A134808 A134809 A134810 * A134812 A134813 A134814

Keyword

fini,full,nonn,base

Author

Omar E. Pol, Nov 30 2007

Extensions

Reference and link added by Omar E. Pol, Mar 25 2011

Status

approved