A094153 a(n) is least prime p such that 7 is the n-th term in the Euclid-Mullin sequence starting at p, or 0 if no such prime p exists.

7, 0, 2, 43, 11, 13, 31, 149, 347, 23, 439, 223, 461, 173, 5, 71, 197, 1153, 191, 307, 1657, 971, 9473, 19, 2399, 1607, 6781, 89, 9187, 281, 23623, 15077, 25579, 17203

Offset

1,1

Comments

The sequence is not monotonic. Compare to A093882.

Next term exceeds 50000. - Sean A. Irvine, Jan 12 2012

Links

Table of n, a(n) for n=1..34.

Example

a(5)=11 because p=7 first arises in EM at position 5, which is initiated with 11: {11,2,23,3,7,10627,433}; see A051309.

Crossrefs

Cf. A000945, A051308-A051334, A056756, A093777-A093783.

Sequence in context: A244979 A118288 A375191 * A243374 A309608 A324479

Adjacent sequences: A094150 A094151 A094152 * A094154 A094155 A094156

Keyword

more,nonn

Author

Labos Elemer, May 05 2004

Extensions

Definition clarified, terms corrected and extended by Sean A. Irvine, Apr 15 2011

More terms from Sean A. Irvine, May 22 2011

25579 and 17203 from Sean A. Irvine, Jan 11 2012

Status

approved