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A061766 a(1) = 4; a(n) = smallest composite number of the form k*a(n-1) + 1. 3
4, 9, 10, 21, 22, 45, 46, 93, 94, 95, 96, 289, 290, 291, 292, 585, 586, 1173, 1174, 1175, 1176, 1177, 1178, 1179, 1180, 2361, 2362, 2363, 2364, 2365, 2366, 2367, 2368, 2369, 2370, 4741, 4742, 4743, 4744, 4745, 4746, 4747, 4748, 4749, 4750, 9501, 9502, 9503 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..48.

EXAMPLE

After 96 the next term is 289 = 3*96+ 1 as 97 and 193 are both primes.

CROSSREFS

Sequence in context: A107621 A098144 A109412 * A109448 A177927 A062398

Adjacent sequences:  A061763 A061764 A061765 * A061767 A061768 A061769

KEYWORD

nonn,easy

AUTHOR

Amarnath Murthy, May 22 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), May 29 2001

STATUS

approved

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Last modified September 26 21:46 EDT 2020. Contains 337377 sequences. (Running on oeis4.)