A068633 a(1) = 11 by convention; for n > 1, if n = p^a*q^b... then a(n) = concatenate(p,a,q,b,...).

11, 21, 31, 22, 51, 2131, 71, 23, 32, 2151, 111, 2231, 131, 2171, 3151, 24, 171, 2132, 191, 2251, 3171, 21111, 231, 2331, 52, 21131, 33, 2271, 291, 213151, 311, 25, 31111, 21171, 5171, 2232, 371, 21191, 31131, 2351, 411, 213171, 431, 22111

Offset: 1

Author

Amarnath Murthy, Feb 27 2002

Keywords

• base
• easy
• nonn

Comments

Apart from the conventional initial term, a duplicate of A067599. See there for further comments, examples, references and other information.

Extensions

Edited by M. F. Hasler, Oct 06 2013