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A239746 Records in A016014. 3
1, 2, 3, 5, 6, 7, 10, 12, 15, 17, 24, 30, 42, 54, 57, 60, 63, 72, 74, 83, 84, 91, 96, 104, 106, 120, 123, 129, 138, 139, 144, 147, 149, 153, 155, 203, 219, 240, 245, 259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..40.

MATHEMATICA

km = 0; Reap[Do[k = 1;  While[ ! PrimeQ[2*n*k + 1], k++]; If[k > km, km = k; Sow[k]], {n,  20000}]][[2, 1]]

CROSSREFS

Cf. A016014, A239727.

Sequence in context: A023746 A090034 A037016 * A101323 A298705 A030051

Adjacent sequences:  A239743 A239744 A239745 * A239747 A239748 A239749

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 26 2014

EXTENSIONS

a(37)-a(40) from Giovanni Resta, Mar 26 2014

STATUS

approved

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Last modified January 17 10:19 EST 2019. Contains 319218 sequences. (Running on oeis4.)