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A176555 Noncomposite concatenations of divisors of some k, ordered by k. 2
1, 13, 17, 139, 113, 13721, 131, 137, 167, 173, 179, 197, 1103, 1109, 111121, 1151, 1163, 1181, 1361183, 1193, 1373219, 1223, 1229, 1379237, 1277, 1283, 1307, 131133121363, 1367, 1373, 13127381, 1409, 1433, 1439, 13157471, 1487, 13163489 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Intersection of A037278 and A018252.

LINKS

Table of n, a(n) for n=1..37.

FORMULA

a(n) = A037278(A176553(n)).

EXAMPLE

For n = 6; a(6) = 13721 because A176553(6) = 21, and divisors of 21 are 1, 3, 7, 21; concatenation of divisors A037278(21) = 13721 is noncomposite number.

CROSSREFS

Sequence in context: A210547 A202136 A123909 * A237423 A292003 A257373

Adjacent sequences:  A176552 A176553 A176554 * A176556 A176557 A176558

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Apr 20 2010

EXTENSIONS

Extended and edited by Charles R Greathouse IV, Apr 27 2010

STATUS

approved

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Last modified January 21 22:54 EST 2021. Contains 340359 sequences. (Running on oeis4.)