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A134951
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Mountain primes.
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18
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Mountain numbers that are prime numbers.
This sequence has 2620 terms. The largest is 134567897654321. [From Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Feb 23 2009, Feb 24 2009]
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REFERENCES
| Chris K. Caldwell and G. L. Honaker, Jr; Prime Curios!, The Dictionary of Prime Number Trivia, CreateSpace (2009), p. 69, 216, 217.
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LINKS
| G. L. Honaker, Jr. and Chris K. Caldwell, Prime Curios! 2620
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FORMULA
| A000040 INTERSECT A134941.
A178333(a(n))*A010051(a(n)) = 1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 25 2010]
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EXAMPLE
| 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
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CROSSREFS
| Cf. A000040, A134941.
Sequence in context: A039558 A045164 A167845 * A173071 A164294 A155924
Adjacent sequences: A134948 A134949 A134950 * A134952 A134953 A134954
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KEYWORD
| fini,nonn,base
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Nov 25 2007
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EXTENSIONS
| Edited by Omar E. Pol (info(AT)polprimos.com), Feb 26 2009
More terms from Max Alekseyev (maxale(AT)gmail.com), Feb 06 2010
Minor edit and reference added by Omar E. Pol, Mar 25 2011
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