A077342 First column of A077341.

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

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 A351374 A160544

Adjacent sequences: A077339 A077340 A077341 * A077343 A077344 A077345

Keyword

base,easy,nonn

Author

Amarnath Murthy, Nov 05 2002

Status

approved