A102497 Primes of the concatenated form 1nn1 where n is an integer >=0.

112121, 113131, 115151, 119191, 127271, 131311, 134341, 136361, 140401, 142421, 145451, 149491, 157571, 158581, 161611, 169691, 170701, 172721, 178781, 182821, 187871, 190901, 191911, 196961, 197971, 1100010001, 1100210021, 1101710171

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Example

112121 is prime and is of the form 1nn1 for n=12.
1100010001 is prime and is of the form 1nn1 for n=1000.

Crossrefs

Cf. A100846; A100496 for the values of n that produce these primes.

Sequence in context: A210131 A111332 A151841 * A215566 A206071 A250526

Adjacent sequences: A102494 A102495 A102496 * A102498 A102499 A102500

Keyword

easy,nonn,base

Author

Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 12 2005

Status

approved