A249868 Number of days between prime dates in a leap year; starting with Feb 2 and ending with Feb 2 in the following year.

1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 32, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 32, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 94, 1, 2, 2, 4, 2, 4, 2, 4, 6, 65

Offset

1,2

Comments

A prime date means that the number of the day of the month and the number for the month are both prime.

The 53 prime dates in a leap year are:

Feb 2, 3, 5, 7, 11, 13, 17, 19, 23, 29

Mar 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31,

May 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31,

Jul 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31,

Nov 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

There are 53 entries in this sequence because the 65 days between Nov 29 and Feb 2 in the following year have also been taken into account.

In A249867 the entry a(9) = 7 is replaced by 6, 2.

Links

Table of n, a(n) for n=1..53.

Crossrefs

Cf. A249867.

Sequence in context: A372330 A303809 A193562 * A255311 A075526 A001223

Adjacent sequences: A249865 A249866 A249867 * A249869 A249870 A249871

Keyword

nonn,fini,full

Author

Wolfdieter Lang, Nov 23 2014

Status

approved