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A164905 Primes from composite numbers by prefixing with 1. 0
19, 127, 139, 149, 151, 157, 163, 181, 191, 193, 199, 1117, 1123, 1129, 1153, 1171, 1187, 1201, 1213, 1217, 1231, 1237, 1249, 1259, 1279, 1289, 1291, 1297, 1301, 1303, 1319, 1321, 1327, 1361, 1381, 1399, 1423, 1427, 1429, 1447, 1451, 1453, 1459, 1471 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The composite numbers are considered in increasing order.

LINKS

Table of n, a(n) for n=1..44.

Dario Alpern, Factorization using the Elliptic Curve Method

EXAMPLE

1493 is a prime from the composite number 493 by prefixing it with 1.

CROSSREFS

Cf. A002808

Sequence in context: A241965 A182193 A109669 * A142106 A078851 A202125

Adjacent sequences:  A164902 A164903 A164904 * A164906 A164907 A164908

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Aug 30 2009

STATUS

approved

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Last modified January 17 22:17 EST 2022. Contains 350410 sequences. (Running on oeis4.)