A195291 Years in the Gregorian calendar which are not (proleptic) leap years.

1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 45, 46, 47, 49, 50, 51, 53, 54, 55, 57, 58, 59, 61, 62, 63, 65, 66, 67, 69, 70, 71, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89, 90, 91, 93, 94, 95, 97, 98, 99, 100

Offset

1,2

Comments

If n does not exactly divide 100, n should exactly divide 4.

If n exactly divides 100, n should exactly divide 400.

Links

Table of n, a(n) for n=1..76.

Index entries for linear recurrences with constant coefficients, order 304.

Index entries for sequences related to calendars

Formula

a(n) = a(n-1) + a(n-303) - a(n-304). [Charles R Greathouse IV, Sep 18 2011]

Mathematica

Select[Range[100], !LeapYearQ[{#}]&] (* Harvey P. Dale, Jan 01 2019 *)

Prog

(PARI) is(n)=n%4||(n%100==0&&n%400) \\ Charles R Greathouse IV, Sep 18 2011

Crossrefs

Cf. A042968.

Sequence in context: A352675 A329974 A059557 * A042968 A337037 A048103

Adjacent sequences: A195288 A195289 A195290 * A195292 A195293 A195294

Keyword

nonn,easy

Author

Kausthub Gudipati, Sep 16 2011

Status

approved