login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A086491 Group the natural numbers such that the n-th group sum is divisible by prime(n): (1, 2, 3), (4, 5), (6, 7, 8, 9), (10, 11), (12, 13, 14, 15, 16, 17, 18, 19, 20, 21), ... Sequence contains the sum of the terms in the n-th group. 2
6, 9, 30, 21, 165, 234, 238, 38, 690, 522, 2325, 4107, 4018, 4988, 564, 9540, 708, 3172, 9380, 21726, 8395, 14615, 1245, 25365, 11155, 8585, 1545, 19795, 55154, 44070, 78486, 64714, 1781, 21684, 102661, 75047, 14287, 81011, 190380, 153624, 249526 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(4) = 10+11 = 21 is divisible by 7 = prime(4).

CROSSREFS

Cf. A086492, A086493.

Sequence in context: A025493 A054871 A091519 * A178597 A179908 A180325

Adjacent sequences:  A086488 A086489 A086490 * A086492 A086493 A086494

KEYWORD

nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 28 2003

EXTENSIONS

More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 16 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 17:48 EST 2012. Contains 205939 sequences.