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A177951 PrimePi(A066903(n)), the index of A066903(n) in the primes. 0
4, 1, 3, 2, 8, 7, 7, 4, 4, 9, 3, 6, 6, 29, 10, 5, 5, 5, 8, 8, 8, 8, 28, 28, 7, 7, 7, 7, 30, 30, 30, 4, 13, 13, 27, 27, 9, 9, 9, 9, 9, 9, 9, 19, 11, 11, 11, 11, 11, 11, 6, 6, 6, 6, 26, 26, 6, 6, 31, 23, 31, 15, 15, 29, 15, 29, 29, 29, 15, 15, 10, 10, 10, 10, 10, 10, 10, 10, 10, 21, 12, 12, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..83.

FORMULA

a(n) = A000720(A066903(n)) = A049084(A066903(n)) . [R. J. Mathar, May 28 2010]

EXAMPLE

a(14)= 29 because prime(29) = 109, and A066903(14) = 109.

CROSSREFS

Cf. A006577, A066903.

Sequence in context: A197840 A019633 A067277 * A222130 A061903 A309603

Adjacent sequences:  A177948 A177949 A177950 * A177952 A177953 A177954

KEYWORD

nonn

AUTHOR

Michel Lagneau, May 15 2010

EXTENSIONS

Clearer definition from R. J. Mathar, May 28 2010

STATUS

approved

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Last modified January 19 14:53 EST 2020. Contains 331049 sequences. (Running on oeis4.)