A109843 Least multiple of n with digit reversal a prime, or 0 if no such multiple exists.

2, 2, 3, 16, 5, 0, 7, 16, 0, 20, 11, 0, 13, 14, 0, 16, 17, 0, 38, 20, 0, 110, 92, 0, 50, 104, 0, 112, 145, 30, 31, 32, 0, 34, 35, 0, 37, 38, 0, 160, 164, 0, 172, 1100, 0, 92, 188, 0, 98, 50, 0, 104, 106, 0, 110, 112, 0, 754, 118, 0, 305, 124, 0, 128, 130, 0, 134, 136, 0, 70, 71, 0

Offset

1,1

Comments

a(3k) = 0, k > 0.

A subsidiary sequence could be obtained by replacing a(3n) by the least multiple of n which on division by largest power of 3 that divides it gives a number whose digit reversal is prime.

Note also that a(77) = 0. - Joshua Zucker, May 04 2006

Links

Table of n, a(n) for n=1..72.

Crossrefs

Sequence in context: A274983 A153938 A060790 * A341768 A184840 A164022

Adjacent sequences: A109840 A109841 A109842 * A109844 A109845 A109846

Keyword

base,easy,nonn

Author

Amarnath Murthy, Jul 06 2005

Extensions

More terms from Joshua Zucker, May 04 2006

Status

approved