A069616 a(1) = 4; 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.

4, 41, 241, 2411, 32411, 324113, 6324113, 63241133, 1563241133, 15632411339, 815632411339, 81563241133919, 281563241133919, 2815632411339191, 322815632411339191, 32281563241133919151, 432281563241133919151

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Example

a(4) = 2411 staring with a(3) =241 and a(5) = 32411 ending in a(4) = 2411.

Crossrefs

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

Sequence in context: A273446 A068169 A069631 * A231653 A057419 A089664

Adjacent sequences: A069613 A069614 A069615 * A069617 A069618 A069619

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