A388037 Primitive terms of A388036.

120, 180, 420, 660, 672, 780, 1890, 2352, 2772, 3150, 4284, 4410, 5616, 5700, 6930, 9072, 11550, 13104, 14448, 14850, 15708, 15792, 16170, 16830, 17850, 18564, 19110, 19530, 23310, 25410, 27090, 27456, 29610, 30030, 31620, 31752, 32832, 33390, 37170, 37740, 40040, 40572, 41820, 42432, 42588, 42780, 43890, 44730

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).

Prog

(PARI)
is_A388036(n) = { my(s=sigma(n), p=2); n *= 3; while(n, if(min(n%p, s%p) != (n%p), return(0)); n = n\p; s = s\p; p = nextprime(1+p)); (1); };
is_A388037(n) = if(!is_A388036(n), 0, fordiv(n, d, if(d<n && is_A388036(d), return(0))); (1));

Crossrefs

Subsequence of A388036.

Cf. also A388025, A388035, A388272.

Sequence in context: A337479 A388019 A322377 * A247851 A179232 A056994

Adjacent sequences: A388034 A388035 A388036 * A388038 A388039 A388040

Keyword

nonn,base

Author

Antti Karttunen, Sep 16 2025

Status

approved