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A185729
Numbers that are the sum of their first k non-divisors for some k.
3
5, 8, 12, 51, 56, 85, 87, 105, 132, 164, 224, 249, 280, 321, 324, 343, 357, 363, 366, 405, 427, 428, 553, 583, 591, 618, 638, 654, 689, 699, 820, 918, 978, 1028, 1045, 1077, 1144, 1207, 1261, 1267, 1268, 1342, 1377, 1417, 1477, 1505, 1517, 1691, 1692, 1707, 1758, 1794, 1805, 1883, 1927, 2197, 2322, 2334, 2384, 2461, 2481, 2523, 2525, 2568
OFFSET
1,1
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
51 is in the sequence because 51 = 2 + 4 + 5 + 6 + 7 + 8 + 9 + 10
(the sum of its first 8 non-divisors)
MATHEMATICA
Select[Range[2600], MemberQ[Accumulate[Complement[Range[#], Divisors[#]]], #]&] (* Harvey P. Dale, Feb 16 2011 *)
PROG
(PARI) is(n)=my(s, t=1); while(s<n, if(n%t++, s+=t)); s==n \\ Charles R Greathouse IV, Nov 23 2015
CROSSREFS
Cf. A185811 (k-values associated with this sequence)
Cf. A064510.
Sequence in context: A338547 A124434 A180930 * A164128 A259912 A078412
KEYWORD
nonn
AUTHOR
Andrew Weimholt, Feb 05 2011
STATUS
approved