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A077207 Triangular number index of A077206(n). 1
1, 5, 32, 126, 141, 447, 4001, 4472, 40001, 44721, 141421, 447214, 3162278, 4472136, 34641016, 109544512, 400000001, 447213596, 3464101616, 10954451150, 31622776602, 77459666925, 316227766017, 774596669241, 1414213562373 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
PROG
(PARI) {rT(m) = ceil((sqrt(8*m+1)-1)/2)} {T(n) = (n*(n+1))/2} m=1; for(n=2, 50, k=rT((m%10)*10^(n-1)); while(T(k)%10==0, k++); m=T(k); print1(" ", k)) (Alekseyev)
CROSSREFS
Cf. A077206.
Sequence in context: A184536 A363411 A089574 * A319790 A273623 A359522
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 02 2002
EXTENSIONS
Corrected and extended by Max Alekseyev, Feb 15 2005
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)