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.

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

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