A387425 -id:A387425 - cp's OEIS frontend

A387424 Partial sums of A387423.

0, 1, 2, 4, 6, 6, 8, 11, 14, 16, 19, 21, 23, 25, 27, 31, 33, 34, 37, 38, 41, 44, 48, 51, 54, 58, 62, 62, 64, 68, 72, 77, 82, 87, 92, 96, 98, 103, 108, 111, 113, 118, 121, 124, 128, 132, 137, 141, 145, 150, 155, 158, 160, 164, 169, 172, 177, 182, 185, 190, 192, 196, 200, 206, 211, 215, 218, 224, 230, 234, 238, 244

Offset: 1

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Antti Karttunen, Sep 01 2025

nonn
base
new

Antti Karttunen, Table of n, a(n) for n = 1..65537
Index entries for sequences related to binary expansion of n.
Index entries for sequences related to sigma(n).

Cf. A000203, A387423.

Cf. also A387425.

up_to = 65537;
A387423(n) = { my(a=binary(n), b=binary(sigma(n)), i=1); while(i<=#a,if(a[i]!=b[i],return(#a-(i-1))); i++); (0); };
A387424list(up_to) = { my(v=vector(up_to)); v[1] = 0; for(n=2,up_to,v[n] = v[n-1]+A387423(n)); (v); };
v387424 = A387424list(up_to);
A387424(n) = v387424[n];

a(1) = 0; for n > 1, a(n) = a(n-1) + A387423(n).

cp's OEIS Frontend

A387424 Partial sums of A387423.

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