A134951 Mountain primes.

131, 151, 181, 191, 1231, 1291, 1321, 1361, 1381, 1451, 1471, 1481, 1531, 1571, 1621, 1721, 1741, 1831, 1861, 1871, 1931, 1951, 12391, 12421, 12451, 12491, 12541, 12641, 12671, 12721, 12781, 12791, 12821, 12841, 12941, 13421, 13451, 13591, 13681

Offset: 1

Author

Omar E. Pol, Nov 25 2007

Keywords

• fini
• full
• nonn
• base

Comments

Mountain numbers that are prime numbers.

This sequence has 2620 terms. The largest is 134567897654321. - Jud McCranie, Feb 23 2009, Feb 24 2009

Examples

			The A-number of this sequence (A134951) is a mountain prime because 134951 is a mountain number and it is also a prime number.
. . . 9 . .
. . . . . .
. . . . . .
. . . . . .
. . . . 5 .
. . 4 . . .
. 3 . . . .
. . . . . .
1 . . . . 1
		

References

• Chris K. Caldwell and G. L. Honaker, Jr; Prime Curios!, The Dictionary of Prime Number Trivia, CreateSpace (2009), p. 69, 216, 217.

Links

• Giovanni Resta, Table of n, a(n) for n = 1..2620 (full sequence)
• G. L. Honaker, Jr. and Chris K. Caldwell, Prime Curios! 2620

Crossrefs

Cf. A000040, A134941.

Formula

A000040 INTERSECT A134941.

A178333(a(n))*A010051(a(n)) = 1. - Reinhard Zumkeller, May 25 2010

Extensions

Edited by Omar E. Pol, Feb 26 2009

More terms from Max Alekseyev, Feb 06 2010

Minor edit and reference added by Omar E. Pol, Mar 25 2011