A134245 Terms in A007468 which are multiples of their indices.

2, 8, 88, 384, 1056, 2310, 207936, 417219, 2978610, 6215400, 9216124, 205006774, 255230655, 576178034, 1157525280, 2038109955, 3053762208, 10584038058, 25042362120, 1025402527504, 2304427934330, 11623068703428

Offset

1,1

Comments

If A007468(j) is a multiple of j, we add A007468(j) to this sequence. This sequence is a subsequence of A007468. - R. J. Mathar, Nov 16 2007

Links

Chai Wah Wu, Table of n, a(n) for n = 1..28

Formula

a(n) = A007468(A134244(n)).

Example

3+5=8 is a multiple of i=2 and is added to the sequence. 7+11+13 is not a multiple of 3 and is skipped. 17+19+23+29=88 is a multiple of 4 and is added to the sequence. 31+37+41+43+47=199 is not a multiple of 5 and is skipped.

Maple

A000217 := proc(n) n*(n+1)/2 ; end: A007468 := proc(n) add( ithprime(j), j=A000217(n-1)+1..A000217(n)) ; end: for n from 1 to 800 do a := A007468(n) ; if a mod n =0 then printf("%d, ", a) ; fi ; od: # R. J. Mathar, Nov 16 2007

Crossrefs

Cf. A134244, A134246, A007468.

Sequence in context: A000532 A333366 A083831 * A141313 A009144 A132316

Adjacent sequences: A134242 A134243 A134244 * A134246 A134247 A134248

Keyword

nonn

Author

Enoch Haga, Oct 15 2007, Oct 16 2007

Extensions

Edited and corrected by R. J. Mathar, Nov 16 2007

Corrected by R. J. Mathar, Nov 16 2007

Edited by Max Alekseyev, Nov 08 2011

Status

approved