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A134951 Mountain primes. 16
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; text; internal format)
OFFSET
1,1
COMMENTS
Mountain numbers that are prime numbers.
This sequence has 2620 terms. The largest is 134567897654321. - Jud McCranie, Feb 23 2009, Feb 24 2009
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
FORMULA
A000040 INTERSECT A134941.
A178333(a(n))*A010051(a(n)) = 1. - Reinhard Zumkeller, May 25 2010
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
CROSSREFS
Sequence in context: A045164 A167845 A273049 * A173071 A164294 A155924
KEYWORD
fini,full,nonn,base
AUTHOR
Omar E. Pol, Nov 25 2007
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
STATUS
approved

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Last modified March 19 07:31 EDT 2024. Contains 370955 sequences. (Running on oeis4.)