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

Author

Rémy Sigrist, Apr 25 2020

Keywords

• nonn
• look
• base

Examples

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

Links

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

Crossrefs

Cf. A001101, A007953, A113315.

Programs

PARI

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

Formula

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