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A176588 a(n) = A176558(A175354(n)) = numbers m as reverse concatenations of divisors of numbers from A175354, where A175354 = numbers k such that reverse concatenations of divisors of k are nonprimes. 2
1, 21, 51, 6321, 8421, 931, 10521, 111, 1264321, 14721, 15531, 168421, 171, 1896321, 20105421, 21731, 221121, 231, 2412864321, 261321, 27931, 28147421, 291, 30151065321, 32168421, 331131, 341721, 35751, 361812964321, 371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

a(9) = 1264321 because A089374(9) = 12 and divisors of 12 are 1, 2, 3, 4, 6, 12; reverse concatenation of divisors A176558(12) = 1264321 is nonprime.

CROSSREFS

Subsequence of A176558(n) = reverse concatenation of divisors of n.

Sequence in context: A235877 A146838 A146593 * A043133 A039310 A043913

Adjacent sequences:  A176585 A176586 A176587 * A176589 A176590 A176591

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Apr 21 2010

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 24 2010

STATUS

approved

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Last modified February 26 11:49 EST 2020. Contains 332279 sequences. (Running on oeis4.)