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A232543 Indices of prime tribonacci numbers (A100683). 22
1, 2, 3, 4, 7, 11, 12, 27, 32, 119, 127, 136, 611, 755, 872, 1676, 5363, 15623, 27564, 42679, 54576, 74123, 91043, 104331 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(25) > 2*10^5.

LINKS

Table of n, a(n) for n=1..24.

MATHEMATICA

a={-1, 2, 2}; Print[1], Print[2]; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[3]]=sum]

CROSSREFS

Cf. A001590, A100683, A231574, A231575, A232542.

Sequence in context: A296446 A226387 A102282 * A279071 A171027 A064933

Adjacent sequences:  A232540 A232541 A232542 * A232544 A232545 A232546

KEYWORD

nonn

AUTHOR

Robert Price, Nov 25 2013

STATUS

approved

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Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)