A075616 Rearrangement of natural numbers so that starting with a(n) the concatenation of n numbers gives a prime.

2, 1, 3, 4, 7, 5, 9, 6, 17, 8, 29, 10, 43, 11, 97, 12, 57, 13, 27, 14, 249, 15, 63, 16, 119, 18, 49, 19, 47, 20, 121, 21, 51, 22, 201, 23, 59, 24, 231, 25, 139, 26, 61, 28, 77, 30, 221, 31, 73, 32, 123, 33, 381, 34, 341, 35, 71, 36, 113, 37, 469, 38, 39, 40

Offset

1,1

Links

Sean A. Irvine and David Consiglio, Jr., Table of n, a(n) for n = 1..500

David Consiglio, Jr., Python program

Sean A. Irvine, Java program (github)

Crossrefs

Cf. A075617 and A073672.

Cf. A075620 (the resulting primes).

Sequence in context: A192439 A160187 A257879 * A160186 A050041 A058658

Adjacent sequences: A075613 A075614 A075615 * A075617 A075618 A075619

Keyword

base,nonn,changed

Author

Amarnath Murthy, Sep 29 2002

Extensions

Edited and extended by Robert G. Wilson v, Oct 02 2002

a(11) onward corrected by Sean A. Irvine, Feb 28 2025

Status

approved