A001356 Dates at fortnightly intervals from Jan 01 in the Julian calendar.

1, 15, 29, 12, 26, 12, 26, 9, 23, 7, 21, 4, 18, 2, 16, 30, 13, 27, 10, 24, 8, 22, 5, 19, 3, 17, 31, 14, 28, 11, 25, 11, 25, 8, 22, 6, 20, 3, 17, 1, 15, 29, 12, 26, 9, 23, 7, 21, 4, 18, 2, 16, 30, 13, 27, 10, 24, 10, 24, 7, 21, 5, 19, 2, 16, 30, 14, 28, 11, 25, 8, 22, 6, 20, 3, 17, 1, 15

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy
• nice

Comments

Sequence assumes that the first year is the year after a leap year.

Periodic sequence with period 1461. - John Cerkan, Mar 26 2017

References

• Archimedeans Problems Drive, Eureka, 13 (1950), 11.
• N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• John Cerkan, Table of n, a(n) for n = 1..10000
• John Cerkan, Python 2.7
• Index entries for sequences related to calendars

Crossrefs

Cf. A051121.

Programs

Mathematica

(* First program no longer functions in current Mathematica versions *)
(* first do *) Needs["Calendar`"]; (* then *) Table[Calendar`DaysPlus[{1, 1, 1}, 14 n][[3]], {n, 0, 77}] (* Robert G. Wilson v, Apr 18 2010 *)
Table[DateValue[DayPlus[{1,1,1},14 n,CalendarType->"Julian"],"Day"],{n,0,77}] (* recent Mathematica version, Giovanni Resta, Mar 22 2017; amended, Ray Chandler, Aug 07 2023 *)

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Mar 17 2000

One more term from Robert G. Wilson v, Apr 18 2010

Name edited by Charles R Greathouse IV, Mar 27 2017