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A174025 Inverse permutation to A003100. 4
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 79, 78, 77 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Franklin T. Adams-Watters, Table of n, a(n) for n = 0..10000

PROG

(PARI) inbase(n, b)=local(r); r=[]; while(n>0, r=concat([n%b], r); n\=b); r

tobase(v, b)=local(r); for(i=1, #v, r=r*b+v[i]); r

a(n)=local(v); v=inbase(n, 10); for(k=2, #v, if(v[k-1]%2==1, v[k]=9-v[k])); tobase(v, 10)

CROSSREFS

Sequence in context: A003100 A118757 A118758 * A106649 A284030 A087121

Adjacent sequences:  A174022 A174023 A174024 * A174026 A174027 A174028

KEYWORD

base,easy,nonn

AUTHOR

Franklin T. Adams-Watters, Mar 05 2010

STATUS

approved

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Last modified November 19 07:02 EST 2017. Contains 294915 sequences.