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A084855 Triangular array, read by rows: T(n,k) = concatenated decimal representations of k and n, 1<=k<=n. 3
11, 12, 22, 13, 23, 33, 14, 24, 34, 44, 15, 25, 35, 45, 55, 16, 26, 36, 46, 56, 66, 17, 27, 37, 47, 57, 67, 77, 18, 28, 38, 48, 58, 68, 78, 88, 19, 29, 39, 49, 59, 69, 79, 89, 99, 110, 210, 310, 410, 510, 610, 710, 810, 910, 1010, 111, 211, 311, 411, 511, 611, 711, 811, 911, 1011, 1111 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Indranil Ghosh, Rows 1..100 of triangle, flattened

FORMULA

T(n, k) = k*10^A055642(n) + n.

T(n, n) = A020338(n).

PROG

(Python)

def T(n, k): return int(str(k) + str(n))

def auptorow(maxrow):

    return [T(n, k) for n in range(1, maxrow+1) for k in range(1, n+1)]

print(auptorow(11)) # Michael S. Branicky, Nov 21 2021

CROSSREFS

Cf. A020338, A055642, A066686, A067574, A084854, A349520.

Sequence in context: A240763 A231871 A192287 * A101233 A118512 A112651

Adjacent sequences:  A084852 A084853 A084854 * A084856 A084857 A084858

KEYWORD

nonn,base,tabl

AUTHOR

Reinhard Zumkeller, Jun 09 2003

STATUS

approved

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Last modified September 30 21:21 EDT 2022. Contains 357106 sequences. (Running on oeis4.)