A032696 Exactly 6 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a prime.

3, 57, 297, 2189, 25697, 76721, 123747, 124443, 132653, 218207, 244099, 261023, 267787, 297059, 304389, 346623, 366989, 411971, 462751, 551057, 596897, 643181, 647193, 665967, 671573, 688143, 701207, 742197, 748563, 867003, 872313, 877331

Offset

1,1

Comments

Finding 7, 8 and 9 preceding digits is a difficult job!

Links

Table of n, a(n) for n=1..32.

Example

If a(n) = 57 then we find '1'57, '2'57, '4'57, '5'57, '7'57 and '8'57 to be primes.

Crossrefs

Sequence in context: A051227 A122548 A078728 * A337790 A131466 A171356

Adjacent sequences: A032693 A032694 A032695 * A032697 A032698 A032699

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Status

approved