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A074813 Number of primes between n and R(n) (inclusive), where R(n) (A004086) is the digit reversal of n. 0
0, 1, 1, 0, 1, 0, 1, 0, 0, 4, 1, 3, 6, 7, 9, 12, 14, 15, 17, 8, 3, 0, 3, 4, 6, 9, 11, 13, 15, 9, 6, 3, 0, 3, 5, 7, 10, 11, 12, 10, 7, 4, 3, 0, 2, 4, 7, 8, 9, 13, 9, 6, 5, 2, 0, 2, 5, 7, 8, 14, 12, 9, 7, 4, 2, 0, 3, 4, 5, 16, 14, 11, 10, 7, 5, 3, 0, 2, 4, 18, 15, 13, 11, 8, 7, 4, 2, 0, 2, 20, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,10
COMMENTS
A060568 is the exclusive version of this sequence.
LINKS
EXAMPLE
The primes between n = 13 and 31, inclusive, are 13, 17, 19, 23, 29, 31; so a(13) = 6.
CROSSREFS
Sequence in context: A121441 A256243 A190479 * A151861 A210583 A200171
KEYWORD
base,easy,nonn
AUTHOR
Jason Earls, Sep 08 2002
STATUS
approved

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Last modified April 20 15:37 EDT 2024. Contains 371844 sequences. (Running on oeis4.)