A317842 Dirichlet convolution of A284013 (= n - A002487(n)) with itself, where A002487 is Stern's Diatomic sequence.

0, 0, 0, 1, 0, 2, 0, 6, 1, 4, 0, 14, 0, 8, 4, 23, 0, 18, 0, 26, 8, 12, 0, 58, 4, 16, 10, 46, 0, 52, 0, 72, 12, 24, 16, 94, 0, 24, 16, 104, 0, 80, 0, 70, 42, 32, 0, 190, 16, 64, 24, 90, 0, 106, 24, 172, 24, 44, 0, 248, 0, 52, 66, 201, 32, 136, 0, 130, 32, 152, 0, 342, 0, 52, 80, 134, 48, 164, 0, 334, 63, 60, 0, 364, 48, 60, 44

Offset: 1

Author

Antti Karttunen, Aug 09 2018

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..16384
• Index entries for sequences related to Stern's sequences

Crossrefs

Cf. A002487, A284013, A317839, A317841, A317843.

Programs

PARI

A002487(n) = { my(a=1, b=0); while(n>0, if(bitand(n, 1), b+=a, a+=b); n>>=1); (b); }; \\ From A002487
A284013(n) = (n - A002487(n));
A317842(n) = sumdiv(n,d,A284013(n/d)*A284013(d));

Formula

a(n) = Sum_{d|n} A284013(n/d)*A284013(d).