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

Offset

1,1

Comments

Period 12.

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

References

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

Links

Table of n, a(n) for n=1..72.

Time and Date, A Calendar website

Index entries for sequences related to calendars

Index to 12-periodic sequences

Example

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

Mathematica

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 *)

Prog

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

Crossrefs

Cf. A089746.

Sequence in context: A076419 A217516 A071420 * A215733 A226750 A336730

Adjacent sequences: A031136 A031137 A031138 * A031140 A031141 A031142

Keyword

nonn,word

Author

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

Status

approved