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A155492 Concatenation of even n and odd n-th nonprime. 0
21, 69, 1015, 1421, 2839, 3245, 4055, 4257, 4663, 4865, 6081, 6891, 7093, 7295, 86115, 88117, 90119, 92121, 94123, 96125, 102133, 104135, 108141, 110143, 112145, 114147, 118153, 120155 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

Since n=2=even and nonprime(2)=1=odd, concatenate 21 = a(1). Since n=6=even and nonprime(6)=9=odd, concatenate 69 = a(2). Since n=10=even and nonprime(10)=15=odd, concatenate 1015 = a(3), etc.

CROSSREFS

Cf. A000027, A141468.

Sequence in context: A020150 A178389 A297304 * A201066 A200931 A044159

Adjacent sequences:  A155489 A155490 A155491 * A155493 A155494 A155495

KEYWORD

nonn,base

AUTHOR

Juri-Stepan Gerasimov, Jan 23 2009

EXTENSIONS

Corrected (1421 inserted, 901119 replaced by 90119, 121145 replaced by 112145) R. J. Mathar, May 10 2010

Edited by N. J. A. Sloane, May 15 2010

STATUS

approved

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Last modified October 23 22:25 EDT 2020. Contains 337975 sequences. (Running on oeis4.)