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A191355 Indices of terms in A069748 with two decimal digits 1 and all others 0. 0
5, 6, 8, 9, 12, 15, 18, 22, 27, 31, 37, 43, 49, 56, 64, 71, 80 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The current terms reach as far as the current contents of the b-file in A002780.

LINKS

Table of n, a(n) for n=1..17.

FORMULA

Conjectural formula: a(n)=5+sum{i=1,...,n-1} A105637(i).

Equivalent conjecture: a(n) = -(-1)^n/8 + A049347(n)/3 +115/24+n/6 +n^2/4. - R. J. Mathar, Jul 11 2011

CROSSREFS

Cf. A002780, A069748, A105637.

Sequence in context: A158698 A120174 A184817 * A047439 A095763 A187843

Adjacent sequences:  A191352 A191353 A191354 * A191356 A191357 A191358

KEYWORD

nonn,base

AUTHOR

Vladimir Shevelev, May 31 2011

STATUS

approved

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Last modified January 19 14:53 EST 2020. Contains 331049 sequences. (Running on oeis4.)