A087352 a(n+1) is the smallest square > a(n) such that every concatenation (n > 1) is a prime.

1, 9, 49, 81, 441, 729, 15129, 33489, 35721, 127449, 184041, 288369, 505521, 594441, 1046529, 4004001, 4941729, 8415801, 14130081, 19474569, 20820969, 21427641, 25070049, 31236921, 33419961, 37197801, 57471561, 58201641, 58844241

Offset

1,2

Links

Table of n, a(n) for n=1..29.

Example

19, 1949, 194981, 194981441 are all primes.

Crossrefs

Cf. A087353.

Sequence in context: A352141 A110873 A167716 * A039940 A369963 A012111

Adjacent sequences: A087349 A087350 A087351 * A087353 A087354 A087355

Keyword

base,nonn

Author

Amarnath Murthy, Sep 08 2003

Extensions

More terms from David Wasserman, May 10 2005

Status

approved