A078271 -id:A078271

Search: a078271 -id:a078271

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page 1

A078272

a(n) = A078271(n)/11.

+20
1

1, 192, 28383, 3756574, 467484765, 55931212956, 6511394941147, 742966858669338, 83479422322397529, 100267134151431672010, 1011027723516153267391101, 10201194682452625419549210192, 102921128651064454379146831029283, 1038303104783380172900742874112848374

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

CROSSREFS

Cf. A078269, A078270, A078271.

KEYWORD

nonn,base

AUTHOR

Amarnath Murthy, Nov 24 2002

EXTENSIONS

More terms from Jinyuan Wang, May 24 2020

STATUS

approved

A078269

a(n) is the number from which if odd-positioned digits are deleted then one gets the concatenation of 1 to n, while if even-positioned digits are deleted then one gets reverse concatenation of 1 to n. Position of least significant digit is considered to be 1.

+10
3

11, 1221, 132231, 14233241, 1524334251, 162534435261, 17263544536271, 1827364554637281, 192837465564738291, 1120394857667584931201, 11213140596877869514031211, 112231415160798897160514131221

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

a(4) = 14233241: deleting alternate digits starting with least significant digit gives 1234 etc.

CROSSREFS

Cf. A078270, A078271.