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A134675 Row sums of triangle A134674. 4
1, 4, 9, 15, 25, 30, 49, 55, 76, 80, 121, 112, 169, 154, 201, 207, 289, 237, 361, 310, 395, 374, 529, 420, 606, 520, 661, 604, 841, 618, 961, 799, 975, 884, 1165, 919, 1369, 1102, 1361, 1202, 1681, 1206, 1849, 1480, 1761, 1610, 2209, 1612, 2360, 1843, 2325, 2062, 2809, 2010, 2897, 2368, 2903, 2552, 3481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For n>1, a(n) = n^2 iff n is prime.

LINKS

John Mason, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = A007434(n) + A001065(n). - Conjectured by John Mason and proved by Max Alekseyev, Jan 07 2015

EXAMPLE

a(4) = 15 = sum of row 4 terms of triangle A134674: (4, + 3 + 4 + 4).

PROG

(PARI) a(n) = sumdiv(n, d, d^2*moebius(n/d)+d)-n /* Max Alekseyev, Jan 07 2015 */

CROSSREFS

Cf. A134674.

Sequence in context: A065893 A052116 A109641 * A050530 A278021 A102084

Adjacent sequences:  A134672 A134673 A134674 * A134676 A134677 A134678

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Nov 05 2007

EXTENSIONS

More terms from John Mason, Jan 07 2015

STATUS

approved

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Last modified June 15 04:47 EDT 2021. Contains 345043 sequences. (Running on oeis4.)