login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A249867
Number of days between prime dates in a non-leap year; starting with Feb 2 and ending with Feb 2 in the following year.
2
1, 2, 2, 4, 2, 4, 2, 4, 7, 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 52 prime dates in a non-leap year are:
Feb 2, 3, 5, 7, 11, 13, 17, 19, 23,
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 52 entries in this sequence because the 65 days between Nov 29 and Feb 2 in the following year have also been taken into account.
CROSSREFS
Cf. A249868.
Sequence in context: A075526 A001223 A118776 * A351612 A092520 A372714
KEYWORD
nonn,fini,full
AUTHOR
Wolfdieter Lang, Nov 23 2014
STATUS
approved