A182495 -id:A182495 - cp's OEIS frontend

A031139 Number of letters in English words for months of year.

7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8, 7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8, 7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8, 7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8, 7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8, 7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8, 7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8

Offset: 1

Dmitri Papichev (Dmitri.Papichev(AT)iname.com)

Period 12: repeat [7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8].

According to the definition this should strictly speaking be finite: there is no 13th month of the year. But for several reasons we prefer to see this as an infinite periodic sequence. - M. F. Hasler, Mar 05 2018

			a(1) = 7 because January has 7 letters.

GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 60.

Time and Date, A Calendar website.
Index entries for sequences related to calendars.
Index to 12-periodic sequences.
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,1).

Cf. A089746, A161376, A182495.

PadRight[{}, 72, {7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8}] (* or *)
Array[StringLength@ DateString[DateObject[{0, Mod[#, 12] + 1, 1, 0, 0, 0}, "Month"], {"MonthName"}] &, 72, 0] (* Michael De Vlieger, Feb 25 2018 *)

A031139(n)=digits(879644355878)[12-n%12] \\ M. F. Hasler, Mar 05 2018

From Elmo R. Oliveira, Jul 18 2024: (Start)
G.f.: x*(7 + 8*x + 5*x^2 + 5*x^3 + 3*x^4 + 4*x^5 + 4*x^6 + 6*x^7 + 9*x^8 + 7*x^9 + 8*x^10 + 8*x^11)/(1 - x^12).
a(n) = a(n-12) for n > 12. (End)

A161376 Number of letters in Spanish words for months of the year.

Original entry on oeis.org

5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9, 5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9, 5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9, 5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9, 5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9, 5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9, 5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9

Offset: 1

Claudio Meller, Jun 08 2009

Enero = 5 letters; Febrero = 7; Marzo = 5; Abril = 5; Mayo = 4; Junio = 5; Julio = 5; Agosto = 6; Septiembre = 10; Octubre = 7; Noviembre = 9; Diciembre = 9.

Period 12: repeat [5, 7, 5, 5, 4, 5, 5, 6, 10, 7, 9, 9].

Index entries for sequences related to calendars.
Index to 12-periodic sequences.
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,1).

Cf. A031139, A182495.

From Elmo R. Oliveira, Jul 18 2024: (Start)
G.f.: x*(5 + 7*x + 5*x^2 + 5*x^3 + 4*x^4 + 5*x^5 + 5*x^6 + 6*x^7 + 10*x^8 + 7*x^9 + 9*x^10 + 9*x^11)/(1 - x^12).
a(n) = a(n-12) for n > 12. (End)

a(37)-a(84) from Elmo R. Oliveira, Jul 18 2024

cp's OEIS Frontend

A031139 Number of letters in English words for months of year.

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