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A121669 Numbers with sum of digits = 19, divisible by 19 and containing the string "19". 2
17119, 19171, 19342, 19513, 20197, 21907, 33193, 34219, 41914, 51319, 61921, 101935, 102619, 112195, 119035, 119206, 121942, 125191, 171019, 171190, 190171, 190342, 190513, 191026, 191710, 192052, 192223, 193420, 194104, 195130, 195301, 197011, 201970, 204193 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Conjecture: There are approximately k(n-1)(n-2)^(n-2) terms of this sequence up to 10^n, where k is about e/(19e-19). - Charles R Greathouse IV, Oct 13 2022
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..12794 (all terms < 10^11)
MATHEMATICA
d19Q[n_]:=Module[{idn=IntegerDigits[n]}, Total[idn]==19&&MemberQ[ Partition[ idn, 2, 1], {1, 9}]]; Select[19*Range[20000], d19Q] (* Harvey P. Dale, Jun 10 2014 *)
PROG
(Python)
def ok(n): s = str(n); return n%19==0 and '19' in s and sum(map(int, s))==19
print(list(filter(ok, range(205000)))) # Michael S. Branicky, Aug 06 2021
CROSSREFS
Intersection of A008601, A166459 and A293879.
Sequence in context: A233611 A233610 A361349 * A247697 A218247 A235891
KEYWORD
nonn,base
AUTHOR
Hassan Taifour (hytaifour(AT)yahoo.co.uk), Sep 10 2006
EXTENSIONS
More terms from Zak Seidov, Sep 12 2006
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)