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A091771 a(0) = 2; for n > 0, a(n) is the least prime of the form k*n*a(n-1) + 1. 4
2, 3, 7, 43, 173, 3461, 62299, 6977489, 55819913, 8038067473, 241142024191, 15915373596607, 2291813797911409, 476697269965573073, 20021285338554069067, 10811494082819197296181, 4670565443777893231950193 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..100

MATHEMATICA

a[0] = 2; a[n_] := a[n] = Block[{k = 1}, While[ !PrimeQ[k*n*a[n - 1] + 1], k++ ]; k*n*a[n - 1] + 1]; Table[ a[n], {n, 0, 16}] (* Robert G. Wilson v Feb 13 2004 *)

CROSSREFS

Cf. A091879.

Sequence in context: A241166 A083369 A000946 * A072714 A051786 A133400

Adjacent sequences:  A091768 A091769 A091770 * A091772 A091773 A091774

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Feb 11 2004

EXTENSIONS

More terms from Ray Chandler, Robert G. Wilson v and Rick L. Shepherd, Feb 12 2004

STATUS

approved

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Last modified September 25 06:05 EDT 2020. Contains 337335 sequences. (Running on oeis4.)