Blockchain and sha256 [15], d += Σ n (n is non-negative integer)

void main() {
    char rnd[128];
    ::sprintf(rnd, “3n + 1 conjecture”);
    unsigned char hash[32];
    CSHA256().Write((const unsigned char *)rnd, ::strlen(rnd)).Finalize(hash);
    hex_printf(&hash);
}

result hash (“3n + 1 conjecture”, d += Σ_n=0⁶³ n, sha256):
0xd413cdc676cf5dfa78dde7cc4a9feb54a21ca616360ad2283f07b45eb7c19b32 — (7)