A388035 Primitive terms of A388034.

6, 28, 304, 496, 945, 1575, 1900, 2205, 2368, 3465, 3700, 3904, 4095, 5056, 5355, 5775, 5985, 6208, 6435, 6976, 7245, 7425, 8085, 8128, 8415, 8925, 9555, 9765, 11655, 12705, 12915, 13545, 14805, 15015, 15028, 15184, 16695, 18585, 19215, 19635, 19900, 21105, 21945, 22365, 22995, 23205, 24885, 25456, 26145, 26565, 28035

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences related to primorial base.

Index entries for sequences related to sigma(n).

Index entries for sequences where odd perfect numbers must occur, if they exist at all.

Prog

(PARI)
is_A388034(n) = { my(s=sigma(n), p=2); n *= 2; while(n, if(min(n%p, s%p) != (n%p), return(0)); n = n\p; s = s\p; p = nextprime(1+p)); (1); };
is_A388035(n) = if(!is_A388034(n), 0, fordiv(n, d, if(d<n && is_A388034(d), return(0))); (1));

Crossrefs

Cf. A000203, A000396 (subsequence), A276086.

Subsequence of A388034.

Cf. also A388037, A388272.

Sequence in context: A049603 A333927 A035527 * A220437 A332465 A335290

Adjacent sequences: A388032 A388033 A388034 * A388036 A388037 A388038

Keyword

nonn,base

Author

Antti Karttunen, Sep 16 2025

Status

approved