A132131 - OEIS

A132131

"Punctual Bird" numbers n with the additional property that n-1 is not a Punctual Bird (cf. A131881).

1, 13, 22, 24, 33, 35, 44, 46, 55, 57, 66, 68, 77, 79, 88, 90, 100, 102, 113, 124, 133, 143, 153, 163, 173, 183, 193, 203, 224, 235, 244, 254, 264, 274, 284, 294, 304, 335, 346, 355, 365, 375, 385, 395, 405, 446, 457, 466, 476, 486, 496, 506, 557, 568, 577, 587

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Punctual Birds (A131881) are all numbers k with A132131(n) <= k < A132132(n) for some n Early Birds (A116700) are all numbers k with A132132(n) <= k < A132131(n+1) for some n

LINKS

Graeme McRae, Table of n, a(n) for n = 1..27348

EXAMPLE

a(1)=1 because 1 is the first Punctual Bird.

a(2)=13 because 1-11 are Punctual Birds and 12 is not a Punctual Bird.

a(3)=22 because 13-20 are Punctual Birds and 21 is not a Punctual Bird.

CROSSREFS

Cf. A033307, A117804, A116700, A131881, A132132, A132133.

Sequence in context: A362098 A158998 A122559 * A375408 A374253 A351291

Adjacent sequences: A132128 A132129 A132130 * A132132 A132133 A132134

KEYWORD

base,nonn

AUTHOR

Graeme McRae, Aug 11 2007

STATUS

approved