A121712 - OEIS

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A121712

Partial sums of A121711.

1

1, 3, 7, 15, 21, 31, 43, 54, 69, 74, 77, 86, 104, 118, 125, 141, 163, 183, 206, 227, 246, 259, 283, 309, 334, 364, 399, 427, 459, 493, 529, 567, 607, 649, 688, 740, 773, 800, 845, 891, 939, 983, 1024, 1074, 1117, 1171, 1227, 1285, 1345, 1407, 1462, 1511, 1562

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OFFSET

1,2

COMMENTS

GCD(a(n)+1,A121711(n+1)) > GCD(a(n),A121711(n+1)+1);

A121711(n) = a(n+1) - a(n).

LINKS

Table of n, a(n) for n=1..53.

CROSSREFS

Sequence in context: A348943 A043725 A182247 * A175544 A373941 A139208

Adjacent sequences: A121709 A121710 A121711 * A121713 A121714 A121715

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 18 2006

STATUS

approved