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A077342 First column of A077341. 4
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 200, 21, 22, 23, 24, 25, 26, 27, 28, 29, 300, 310, 32, 33, 34, 35, 36, 37, 38, 39, 400, 410, 420, 43, 44, 45, 46, 47, 48, 49, 500, 510, 520, 530, 54, 55, 56, 57, 58, 59, 600, 610, 620, 630, 640, 65, 66, 67 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(20) = 200 and not 20. Can anyone derive a formula for a(n)?

a(n) = n when n > 10 * floor(n/10) + floor(n/10) - 2. Otherwise it is guaranteed that n has appeared in a previous row of the triangle. - Alonso del Arte, Jan 07 2013

LINKS

Hans Havermann, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A077339, A077340, A077341, A077343.

Sequence in context: A008554 A055644 A229621 * A242474 A160544 A276568

Adjacent sequences:  A077339 A077340 A077341 * A077343 A077344 A077345

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Nov 05 2002

STATUS

approved

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Last modified October 26 02:14 EDT 2021. Contains 348256 sequences. (Running on oeis4.)