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A167853
Generalized mountain primes.
7
2, 3, 5, 7, 131, 151, 163, 173, 181, 191, 193, 197, 241, 251, 263, 271, 281, 283, 293, 353, 373, 383, 397, 461, 463, 487, 491, 563, 571, 587, 593, 673, 683, 691, 787, 797, 1231, 1283, 1291, 1297, 1321, 1361, 1373, 1381, 1451, 1453, 1471
OFFSET
1,1
COMMENTS
Primes in A134853. This sequence is finite because A134853 is.
Superset of A134951, mountain primes.
Question: How many terms are in this sequence?
The last term is a(7145) = 134567897654321. - Giovanni Resta, Mar 19 2013
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..7145 (full sequence)
EXAMPLE
Illustration of 136973 as a generalized mountain prime:
. . . 9 . .
. . . . . .
. . . . 7 .
. . 6 . . .
. . . . . .
. . . . . .
. 3 . . . 3
. . . . . .
1 . . . . .
CROSSREFS
KEYWORD
base,fini,full,nonn
AUTHOR
Omar E. Pol, Nov 13 2009, Nov 15 2009
EXTENSIONS
More terms provided. Harvey P. Dale, Aug 19 2010
a(37)-a(47) corrected by Giovanni Resta, Mar 19 2013
STATUS
approved