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A176556 Nonprime concatenations of divisors of some k, ordered by k. 2
1, 12, 124, 15, 1236, 1248, 12510, 111, 1234612, 12714, 13515, 124816, 117, 1236918, 119, 12451020, 121122, 123, 1234681224, 1525, 121326, 13927, 12471428, 129, 12356101530, 12481632, 131133, 121734, 15735, 123469121836, 121938, 131339 (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..32.

FORMULA

a(n) = A037278(A176554(n)).

EXAMPLE

For n = 6; a(6) = 1248 because A176554(6) = 8 and divisors of 8 are 1, 2, 4, 8; concatenation of divisors A037278(8) = 1248 is nonprime number.

CROSSREFS

Sequence in context: A074158 A071269 A061088 * A175252 A173578 A291065

Adjacent sequences:  A176553 A176554 A176555 * A176557 A176558 A176559

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 March 26 14:18 EDT 2019. Contains 321497 sequences. (Running on oeis4.)