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A249728 After a(1) = 1 each n appears A000720(n) times. 3
1, 2, 3, 3, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10016

MATHEMATICA

Join[{1}, Table[Table[n, PrimePi[n]], {n, 20}]//Flatten] (* Harvey P. Dale, Nov 24 2018 *)

PROG

(Scheme, with Antti Karttunen's IntSeq-library)

(define A249727 (COMPOSE (LEAST-GTE-I 0 1 A046992) -1+)) ;; One-based.

CROSSREFS

Cf. A000720, A046992, A249727, A249809.

Sequence in context: A023964 A328179 A000267 * A060020 A300154 A166127

Adjacent sequences:  A249725 A249726 A249727 * A249729 A249730 A249731

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 06 2014

STATUS

approved

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Last modified April 1 14:52 EDT 2020. Contains 333163 sequences. (Running on oeis4.)