A110434 Distinct numbers with least significant digit following the repetitive pattern 1,3,7,9,1,3,7,9,... such that every partial concatenation is a prime.

11, 3, 17, 49, 51, 93, 87, 269, 151, 183, 167, 79, 371, 273, 217, 329, 31, 443, 187, 1049, 271, 213, 587, 969, 181, 873, 1187, 429, 411, 253, 557, 99, 1351, 323, 3627, 469, 2951, 813, 697, 459, 2061, 603, 77, 489, 1251, 1443, 297, 2079, 561, 753, 507, 1959, 1041

Offset

1,1

Comments

Conjecture: every number == 1,3,7,9 (mod 10) is a term.

Pseudoprimality, but not primality, checked for some of the larger numbers involved here. - Joshua Zucker, May 11 2006

Links

Table of n, a(n) for n=1..53.

Example

11,113,11317,1131749,... etc. are all prime.

Crossrefs

Sequence in context: A088262 A110406 A237454 * A110798 A350246 A329293

Adjacent sequences: A110431 A110432 A110433 * A110435 A110436 A110437

Keyword

base,nonn

Author

Amarnath Murthy, Aug 02 2005

Extensions

More terms from Joshua Zucker, May 11 2006

Status

approved