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 A102140 Iccanobirt prime indices (10 of 15): Indices of prime numbers in A102120. 1
 4, 6, 7, 11, 12, 20, 25, 45, 113, 193, 1214, 1272, 2435, 4007, 12258, 12771, 14166, 27368, 29184 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS No more terms through 5000. a(20) > 50000. - Robert Price, Nov 10 2018 LINKS Table of n, a(n) for n=1..19. FORMULA A102120(a(n)) = A102160(n). MATHEMATICA b[0] = b[1] = 0; b[2] = 1; b[n_] := b[n] = IntegerReverse[b[n - 1] + IntegerReverse[b[n - 2]] + b[n - 3]]; Reap[Do[If[PrimeQ[b[n]], Print[n]; Sow[n]], {n, 5000}]][[2, 1]] (* Jean-François Alcover, Dec 15 2017 *) CROSSREFS Cf. A000040, A102120, A102131-A102145. Sequence in context: A110605 A206775 A287157 * A047289 A345717 A022436 Adjacent sequences: A102137 A102138 A102139 * A102141 A102142 A102143 KEYWORD nonn,more,base AUTHOR Jonathan Vos Post and Ray Chandler, Dec 31 2004 EXTENSIONS a(15)-a(19) from Robert Price, Nov 10 2018 STATUS approved

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Last modified June 15 19:43 EDT 2024. Contains 373410 sequences. (Running on oeis4.)