A068661 Let N = 123456789101112131415... the concatenation of natural numbers; partition this number into minimal strings of noncomposite numbers, i.e., a(1) = 1 and a(2) onwards are primes.

1, 2, 3, 4567, 89, 101, 11, 2, 13, 14151617, 181, 920212223242526272829303132333435363738394041424344454647484950515253, 5, 455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989

Offset

1,2

Comments

The terms a(12) and a(14) have been certified prime with Primo. - Rick L. Shepherd, Apr 27 2002

Links

Table of n, a(n) for n=1..14.

Crossrefs

Cf. A033307.

Sequence in context: A020345 A341715 A085943 * A271631 A068826 A085944

Adjacent sequences: A068658 A068659 A068660 * A068662 A068663 A068664

Keyword

base,nonn

Author

Amarnath Murthy, Mar 01 2002

Extensions

Corrected and extended by Rick L. Shepherd, Apr 04 2002

a(7)-a(9) corrected by Sean A. Irvine, Mar 03 2024

Status

approved