A069617 a(1) = 5; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n-1). Alternate left and right concatenation yielding primes.

5, 53, 353, 3533, 33533, 3353321, 113353321, 1133533213, 101133533213, 10113353321311, 310113353321311, 3101133533213117, 143101133533213117, 14310113353321311739, 314310113353321311739, 314310113353321311739103

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Example

a(4) = 3533 staring with a(3) =353 and a(5) = 33533 ending in a(4) = 3533.

Crossrefs

Cf. A053582, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A069613, A069614, A069615, A069616.

Sequence in context: A242906 A068170 A069632 * A173879 A058390 A221236

Adjacent sequences: A069614 A069615 A069616 * A069618 A069619 A069620

Keyword

nonn,base

Author

Amarnath Murthy, Mar 27 2002

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003

Status

approved