A069617 - OEIS

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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

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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