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A077695 a(n) = triangular number pertaining to the number f(n) obtained by concatenating n n times. 0
1, 253, 55611, 9876790, 1543206790, 222222111111, 30246911419753, 3950617249382716, 499999999500000000, 51015202530354045509590858075706560555, 617283950617283950617716049382716049382716 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = triangular number corresponding to A000461(n).

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

a(4) = 9876790 = 4444*4445/2.

CROSSREFS

Cf. A077692, A077693, A077694, A000461.

Sequence in context: A255182 A176087 A006060 * A253880 A145628 A237419

Adjacent sequences:  A077692 A077693 A077694 * A077696 A077697 A077698

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 18 2002

EXTENSIONS

More terms from Sascha Kurz, Jan 07 2003

STATUS

approved

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Last modified January 21 22:54 EST 2021. Contains 340359 sequences. (Running on oeis4.)