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

Author

Labos Elemer, May 05 2004

Keywords

• more
• nonn

Comments

The sequence is not monotonic. Compare to A093882.

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

Examples

			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.

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