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A182776 Mountain nonprimes. 1
1, 121, 141, 161, 171, 1241, 1251, 1261, 1271, 1281, 1341, 1351, 1371, 1391, 1421, 1431, 1461, 1491, 1521, 1541, 1561, 1581, 1591, 1631, 1641, 1651, 1671, 1681, 1691, 1731, 1751, 1761, 1781, 1791, 1821, 1841, 1851, 1891, 1921, 1941, 1961, 1971, 1981, 12321, 12341, 12351, 12361, 12371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The total number of terms is 19226. The largest is 12345678987654321 which is also the largest Giza number A134810.

LINKS

Table of n, a(n) for n=1..48.

FORMULA

A018252 INTERSECT A134941.

EXAMPLE

a(2)=121 is in the sequence because 121 is a nonprime number A018252 and 121 is also a mountain number A134941.

Illustration of 134961 as a mountain nonprime:

. . . 9 . .

. . . . . .

. . . . . .

. . . . 6 .

. . . . . .

. . 4 . . .

. 3 . . . .

. . . . . .

1 . . . . 1

CROSSREFS

Cf. A018252, A134810, A134941, A134951.

Sequence in context: A050697 A319923 A020253 * A080466 A271630 A038511

Adjacent sequences:  A182773 A182774 A182775 * A182777 A182778 A182779

KEYWORD

nonn,base,fini

AUTHOR

Omar E. Pol, Dec 14 2010

STATUS

approved

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Last modified October 19 03:13 EDT 2019. Contains 328211 sequences. (Running on oeis4.)