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A070846 Smallest prime == 1 mod (2n). 10
3, 5, 7, 17, 11, 13, 29, 17, 19, 41, 23, 73, 53, 29, 31, 97, 103, 37, 191, 41, 43, 89, 47, 97, 101, 53, 109, 113, 59, 61, 311, 193, 67, 137, 71, 73, 149, 229, 79, 241, 83, 337, 173, 89, 181, 277, 283, 97, 197, 101, 103, 313, 107, 109, 331, 113, 229, 233, 709, 241 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Dmitry Kamenetsky, Table of n, a(n) for n = 1..50000

FORMULA

a(n) = 2*n*A016014(n) + 1. - Dmitry Kamenetsky, Oct 26 2016

MATHEMATICA

With[{prs=Prime[Range[200]]}, Flatten[Table[Select[prs, Mod[#, 2n]==1&, 1], {n, 60}]]] (* Harvey P. Dale, Jan 16 2013 *)

PROG

(PARI) for(n=1, 80, s=1; while((isprime(s)*s-1)%(2*n)>0, s++); print1(s, ", "))

CROSSREFS

Cf. A070847 to A070853.

Cf. A034694, A016014.

Sequence in context: A291107 A132445 A307437 * A078683 A099863 A112092

Adjacent sequences:  A070843 A070844 A070845 * A070847 A070848 A070849

KEYWORD

nonn

AUTHOR

Amarnath Murthy, May 15 2002

EXTENSIONS

More terms from Benoit Cloitre, May 18 2002

STATUS

approved

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Last modified October 15 19:25 EDT 2019. Contains 328037 sequences. (Running on oeis4.)