A351457 a(n) = A351456(n) - A339905(n).

0, -1, -2, 8, -5, -6, -8, -4, 14, -11, -6, 8, -12, -18, -22, 84, -14, -2, -20, -12, -36, -18, -20, -24, 0, -28, -40, -16, -29, -46, -18, 40, -36, -32, -58, 296, -28, -42, -56, -44, -32, -76, -44, 24, -66, -48, -44, 136, 8, -36, -64, -16, -50, -104, -66, -72, -84, -59, -30, -72, -50, -54, -100, 1028, -92, -84, -66

Offset

1,3

Links

Antti Karttunen, Table of n, a(n) for n = 1..20000

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to sigma(n)

Formula

a(n) = A351445(A003961(n)) = A351456(n) - A339905(n).

Prog

(PARI)
A339905(n) = if(1==n, n, my(f=factor(n)); for(i=1, #f~, f[i, 1] = nextprime(1+f[i, 1])-1); factorback(f));
A003958(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1]--); factorback(f); };
A003961(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); };
A351456(n) = A003958(sigma(A003961(n)));
A351457(n) = (A351456(n) - A339905(n));

Crossrefs

Cf. A000203, A003958, A003961, A003973, A339905, A351442, A351456.

Cf. also A348736.

Sequence in context: A248936 A019678 A115319 * A122387 A021039 A247670

Adjacent sequences: A351454 A351455 A351456 * A351458 A351459 A351460

Keyword

sign

Author

Antti Karttunen, Feb 12 2022

Status

approved