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A051616 Primes for which A051614 is 3 but are not in A005834. 6
17, 47, 71, 107, 137, 167, 197, 227, 257, 263, 317, 347, 401, 449, 467, 557, 569, 587, 599, 617, 647, 677, 701, 797, 827, 839, 857, 863, 881, 887, 929, 947, 971, 977, 1061, 1097, 1181, 1187, 1217, 1259, 1277, 1283, 1307, 1367, 1373, 1427, 1433, 1487, 1493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

FORMULA

p values so that F(2*p*F(2*p+1)+1)=3 and 2p+1 is not prime; F(x) is the least prime divisor of x.

CROSSREFS

Cf. A000945, A051309 - A051335, A005384.

Sequence in context: A034783 A275770 A126912 * A061275 A128468 A031374

Adjacent sequences:  A051613 A051614 A051615 * A051617 A051618 A051619

KEYWORD

nonn

AUTHOR

Labos Elemer

STATUS

approved

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Last modified October 22 17:55 EDT 2019. Contains 328319 sequences. (Running on oeis4.)