

A063756


Number of groups of order <= n.


7



1, 2, 3, 5, 6, 8, 9, 14, 16, 18, 19, 24, 25, 27, 28, 42, 43, 48, 49, 54, 56, 58, 59, 74, 76, 78, 83, 87, 88, 92, 93, 144, 145, 147, 148, 162, 163, 165, 167, 181, 182, 188, 189, 193, 195, 197, 198, 250, 252, 257, 258, 263, 264, 279, 281, 294, 296
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OFFSET

1,2


COMMENTS

The subsequence of prime partial sums of A000001 begins a(2) = 2, a(3) = 3, a(4) = 5, a(11) = 19, a(17) = 43, a(23) = 59, a(27) = 83, a(39) = 167, a(40) = 181, a(44) = 193, a(46) = 197, a(50) = 257, a(52) = 263, a(55) = 281, a(61) = 313, a(65) = 587, a(72) = 653. [From Jonathan Vos Post, Feb 12 2010]


LINKS

Eric M. Schmidt, Table of n, a(n) for n = 1..2047


MATHEMATICA

Table[Sum[FiniteGroupCount[k], {k, 1, n}], {n, 1, 57}] (* Geoffrey Critzer, Feb 06 2013 *)


CROSSREFS

Partial sums of A000001, which is the main entry for this sequence.
Sequence in context: A035399 A153775 A173666 * A117522 A299101 A335658
Adjacent sequences: A063753 A063754 A063755 * A063757 A063758 A063759


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Aug 14 2001


STATUS

approved



