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 A324701 Lexicographically earliest sequence containing 1 and all positive integers n such that the prime indices of n - 1 already belong to the sequence. 12
 1, 3, 5, 6, 9, 11, 12, 14, 17, 21, 23, 24, 26, 27, 32, 33, 38, 41, 44, 45, 47, 51, 53, 56, 60, 63, 65, 66, 74, 75, 81, 84, 87, 89, 90, 93, 101, 102, 104, 105, 111, 116, 119, 122, 125, 126, 129, 131, 132, 138, 144, 147, 149, 156, 161, 164, 167, 170, 173, 177 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A self-describing sequence, similar to A304360. A prime index of n is a number m such that prime(m) divides n. The multiset of prime indices of n is row n of A112798. LINKS Table of n, a(n) for n=1..60. FORMULA a(n) = A324700(n) + 1. MATHEMATICA aQ[n_]:=Switch[n, 0, False, 1, True, _, And@@Cases[FactorInteger[n-1], {p_, k_}:>aQ[PrimePi[p]]]]; Select[Range[0, 100], aQ] CROSSREFS Prime indices of A324700. Cf. A000002, A000720, A001222, A001462, A007097, A055396, A061395, A079000, A079254, A109298, A112798, A276625, A277098, A304360. Cf. A324694, A324695, A324696, A324697, A324698, A324699, A324702, A324703, A324704, A324705. Sequence in context: A225005 A053091 A367499 * A047271 A047445 A341349 Adjacent sequences: A324698 A324699 A324700 * A324702 A324703 A324704 KEYWORD nonn AUTHOR Gus Wiseman, Mar 10 2019 STATUS approved

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Last modified November 30 02:46 EST 2023. Contains 367452 sequences. (Running on oeis4.)