A165660 - OEIS

A165660

Denominators of A007504 divided by A033955, starting from the second term of A033955.

1, 3, 2, 8, 13, 18, 27, 29, 23, 56, 7, 74, 44, 98, 67, 49, 171, 200, 217, 28, 137, 309, 17, 116, 209, 448, 471, 174, 571, 629, 137, 739, 111, 793, 853, 318, 997, 1002, 560, 164, 610, 446, 1419, 1466, 385, 1615, 1573, 1633, 1707, 1825, 946, 662, 2221, 781, 1198

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OFFSET

1,2

COMMENTS

Conjecture: with the exception of the second term, 2 <= A165659(n)/a(n) < 3.

LINKS

Table of n, a(n) for n=1..55.

PROG

(PARI) a1(n)=sum(i=1, n, prime(i)); b1(n)=sum(i=1, n, prime(n+1)%prime(i)); a(n)=if(n<0, 0, denominator(a1(n)/b1(n))); for(n=1, 50, print1(a(n) ", "))

CROSSREFS

Cf. A007504, A033995, A002110, A102647, A165657, A165658, A165659.

Sequence in context: A088551 A373288 A301903 * A171634 A107300 A285787

Adjacent sequences: A165657 A165658 A165659 * A165661 A165662 A165663

KEYWORD

easy,nonn

AUTHOR

Creighton Dement, Sep 24 2009

EXTENSIONS

Terms corrected by Creighton Dement, Oct 03 2009

One conjecture removed by R. J. Mathar, Oct 09 2009

Typo in definition corrected by Creighton Dement, Oct 09 2009

STATUS

approved