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A129341 Numbers n such that n-th and (n+1)th triangular numbers have no common digit. 0
0, 1, 2, 3, 7, 8, 10, 11, 12, 23, 27, 31, 34, 36, 41, 76, 88, 631, 774, 893, 2827 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
No more terms <5000000. Is the sequence finite?
The PARI program shows that there is no further term up to 10^100. - Robert Gerbicz, Jun 10 2007
LINKS
EXAMPLE
n=893: T(n)=399171, T(n+1)=400065; n=2827: T(n)=3997378, T(n+1)=4000206.
MATHEMATICA
Join[{0}, Flatten[Position[Partition[IntegerDigits/@Accumulate[Range[ 3000]], 2, 1], _?(Intersection[First[#], Last[#]]=={}&), {1}, Heads->False]]] (* Harvey P. Dale, Jun 03 2014 *)
PROG
(PARI) M=-1; for(h=0, 200, for(k=1, 9, b=(sqrtint(8*k*10^h)-1)\2; d1=d2=vector(10, n, 0); n=b*(b+1)/2; while(n>0, d1[n%10+1]=1; n\=10); n=(b+1)*(b+2)/2; while(n>0, d2[n%10+1]=1; n\=10); T=1; for(i=1, 10, if(d1[i]*d2[i]>0, T=0; break)); if(T&&(M<b), M=b; print1(b, ", ")))) - Robert Gerbicz, Jun 10 2007
CROSSREFS
Cf. A000217.
Sequence in context: A246448 A054996 A338691 * A115985 A131210 A088340
KEYWORD
base,nonn
AUTHOR
Zak Seidov, May 28 2007
STATUS
approved

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)