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A066738 Primes that are concatenations of nonprime numbers. 1
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 (list; graph; refs; listen; history; text; internal format)
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 A081027 A322474

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

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Last modified July 8 04:16 EDT 2020. Contains 335504 sequences. (Running on oeis4.)