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A075617 Rearrangement of natural numbers so that starting with a(n) the concatenation of n numbers gives a composite number. 1
4, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 14, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..72.

EXAMPLE

4, 12, 235, 3567, etc. are composite.

CROSSREFS

Cf. A075616.

Sequence in context: A072046 A123609 A215645 * A055182 A298919 A190649

Adjacent sequences:  A075614 A075615 A075616 * A075618 A075619 A075620

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 29 2002

EXTENSIONS

Corrected and extended by David Wasserman, Jan 21 2005

STATUS

approved

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Last modified March 25 10:31 EDT 2019. Contains 321470 sequences. (Running on oeis4.)