A034780 - OEIS

A034780

Numbers k such that A034693(k) = 4.

7, 13, 25, 27, 37, 43, 45, 49, 57, 67, 73, 79, 84, 87, 93, 97, 115, 127, 139, 142, 160, 163, 169, 175, 177, 193, 199, 205, 207, 213, 234, 235, 253, 255, 258, 265, 267, 277, 279, 295, 298

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OFFSET

1,1

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..656

MATHEMATICA

Position[#, 4] &@ Table[k = 1; While[! PrimeQ[k n + 1], k++]; k, {n, 300}] // Flatten (* Michael De Vlieger, Mar 02 2017 *)

CROSSREFS

Cf. A034693, A034694.

Sequence in context: A090992 A259215 A215333 * A137165 A087195 A255653

Adjacent sequences: A034777 A034778 A034779 * A034781 A034782 A034783

KEYWORD

nonn

AUTHOR

Labos Elemer

STATUS

approved