|
| |
|
|
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. [From 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. [From 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
|
Cf. A000040, A134941.
Sequence in context: A045164 A167845 A273049 * A173071 A164294 A155924
Adjacent sequences: A134948 A134949 A134950 * A134952 A134953 A134954
|
|
|
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
|
| |
|
|
