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A102885 Index of n in the primes A000040 or nonprimes A141468. 0
1, 2, 1, 2, 3, 3, 4, 4, 5, 6, 7, 5, 8, 6, 9, 10, 11, 7, 12, 8, 13, 14, 15, 9, 16, 17, 18, 19, 20, 10, 21, 11, 22, 23, 24, 25, 26, 12, 27, 28, 29, 13, 30, 14, 31, 32, 33, 15, 34, 35, 36, 37, 38, 16, 39, 40, 41, 42, 43, 17, 44, 18, 45, 46, 47, 48, 49, 19, 50, 51, 52, 20, 53, 21, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The nonnegative numbers n occur exactly once in either A000040 or A141468. The sequence lists the corresponding index. It is a permutation of A008619.

LINKS

Table of n, a(n) for n=0..74.

FORMULA

A141468(a(n))=n or A000040(a(n))=n.

CROSSREFS

Cf. A141468, A000040, A026233.

Sequence in context: A214154 A048219 A087188 * A323089 A239511 A264052

Adjacent sequences:  A102882 A102883 A102884 * A102886 A102887 A102888

KEYWORD

nonn,easy

AUTHOR

Juri-Stepan Gerasimov, Aug 17 2008

EXTENSIONS

Edited by R. J. Mathar, Aug 19 2008

STATUS

approved

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Last modified June 17 05:45 EDT 2021. Contains 345080 sequences. (Running on oeis4.)