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A249182 Proceed counterclockwise on the outer keys of a numeric keypad (i.e., 1,2,3,6,9,8,7,4): first single digits, then concatenate two digits, then three, etc. 0
1, 2, 3, 6, 9, 8, 7, 4, 12, 23, 36, 69, 98, 87, 74, 41, 123, 236, 369, 698, 987, 874, 741, 412, 1236, 2369, 3698, 6987, 9874, 8741, 7412, 4123, 12369, 23698, 36987, 69874, 98741, 87412, 74123, 41236, 123698, 236987, 369874, 698741, 987412, 874123, 741236, 412369 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

k-digit terms start at index 8k-7; for example, at index 57, start the 8-digit terms 12369874, 23698741, 36987412, 69874123, 98741236, 87412369, 74123698, 41236987.

LINKS

Table of n, a(n) for n=1..48.

PROG

(PARI) d=Vec("12369874"); for(L=1, 6, for(i=1, #d, print1(concat(vector(L, j, d[(i+j-2)%#d+1]))", ")))

CROSSREFS

Cf. A059805, A091331, A091332, A249163.

Sequence in context: A087494 A021426 A309008 * A189968 A097108 A140783

Adjacent sequences:  A249179 A249180 A249181 * A249183 A249184 A249185

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, Oct 23 2014

STATUS

approved

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Last modified October 21 01:18 EDT 2019. Contains 328291 sequences. (Running on oeis4.)