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A083192 a(1) = 1, then the rearrangement of composite numbers such that the concatenation of n terms from the n-th term is a prime. (Concatenation of n-th term to (2n-1)th term is a prime number). 1
1, 4, 21, 6, 49, 8, 77, 9, 39, 10, 81, 12, 221, 14, 63, 15, 203, 16, 143, 18, 511, 20, 217, 22, 279, 24, 299, 25, 319, 26, 33, 27, 147, 28, 943, 30, 121, 32, 87, 34, 333, 35, 781, 36, 249, 38, 679, 40, 99, 42, 117, 44, 1463, 45, 697, 46, 187, 48, 207, 50, 219, 51, 639, 52 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..64.

EXAMPLE

421, 21649, etc. are primes.

CROSSREFS

Cf. A083193.

Sequence in context: A103896 A244955 A272969 * A225540 A128452 A202450

Adjacent sequences:  A083189 A083190 A083191 * A083193 A083194 A083195

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Apr 27 2003

EXTENSIONS

Corrected a(11)=81 and extended by Ray Chandler, Jan 04 2009

STATUS

approved

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Last modified September 22 22:42 EDT 2018. Contains 315270 sequences. (Running on oeis4.)