A066738 Primes that are concatenations of nonprime numbers.

11, 19, 41, 61, 89, 101, 109, 127, 139, 149, 151, 157, 163, 181, 191, 193, 199, 211, 229, 241, 251, 269, 271, 281, 331, 349, 359, 389, 401, 409, 419, 421, 433, 439, 449, 457, 461, 463, 487, 491, 499, 509, 521, 541, 569, 571, 601, 619, 631, 641, 659, 661

Offset

1,1

Links

Table of n, a(n) for n=1..52.

Example

The prime 163 is the concatenation of nonprime numbers 1 and 63. 419 is the concatenation of 4, 1 and 9.

Crossrefs

Sequence in context: A136026 A033201 A154386 * A278799 A337508 A081027

Adjacent sequences: A066735 A066736 A066737 * A066739 A066740 A066741

Keyword

base,easy,nonn

Author

Joseph L. Pe, Jan 16 2002

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Apr 03 2002

Status

approved