A074813 Number of primes between n and R(n) (inclusive), where R(n) (A004086) is the digit reversal of n.

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

Offset

1,10

Comments

A060568 is the exclusive version of this sequence.

Links

Table of n, a(n) for n=1..91.

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

Adjacent sequences: A074810 A074811 A074812 * A074814 A074815 A074816

Keyword

base,easy,nonn

Author

Jason Earls, Sep 08 2002

Status

approved