A334375 a(n) equals the n-th Moran number (A001101) divided by its sum of digits.

2, 7, 3, 7, 5, 7, 7, 37, 19, 13, 19, 19, 17, 13, 19, 19, 13, 11, 67, 23, 19, 37, 19, 19, 29, 19, 19, 37, 37, 31, 19, 67, 37, 47, 37, 31, 37, 73, 43, 37, 59, 37, 31, 37, 67, 37, 43, 37, 79, 73, 61, 41, 43, 37, 89, 73, 67, 47, 37, 61, 53, 37, 337, 127, 113, 109

Offset

1,1

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Formula

a(n) = A001101(n) / A007953(A001101(n)).

Example

For n = 42:
- A001101(42) = 555,
- A007953(555) = 15,
- hence a(42) = 555/15 = 37.

Prog

(PARI) for (n=1, 1090, if (n%(s=sumdigits(n))==0 && isprime(n/s), print1 (n/s", ")))

Crossrefs

Cf. A001101, A007953, A113315.

Sequence in context: A083119 A246163 A198388 * A011304 A196392 A021789

Adjacent sequences: A334372 A334373 A334374 * A334376 A334377 A334378

Keyword

nonn,look,base

Author

Rémy Sigrist, Apr 25 2020

Status

approved