A342836 a(n) is the smallest prime factor of A342834(n).

7, 797, 3, 7, 37, 3023681, 43, 1249, 7, 3, 23, 11, 3, 19, 3, 13390093693131976661567, 193, 2069, 11, 41, 3, 71, 3, 996370591, 3, 101, 1123, 54367, 159469, 151, 29, 3, 7

Offset: 1

Author

Bernard Schott, Mar 24 2021

Keywords

• nonn
• base
• more

Comments

a(n) = A342834(n) for n = 1 and n = 2, no other solution is known.

No primes through a(258). - Michael S. Branicky, Mar 25 2021

a(34) <= 7944676315964871787139677901. a(35)..a(40) = 2089, 11, 3, 23, 3, 11. a(42)=3. - Chai Wah Wu, Mar 26 2021

Examples

			As A342834(5) = 7||97||997||9973||99991 = 797997997399991 = 37 * 951649 * 22663307, then a(5) = 37.
		

Links

• Chai Wah Wu, terms a(44)..a(84)

Crossrefs

Cf. A020639, A338968, A342834, A342835.

Formula

a(n) = A020639(A342834(n)).

Extensions

a(4)-a(14) from Daniel Suteu, Mar 24 2021

a(15)-a(33) from Michael S. Branicky and Apurva Rai, Mar 25 2021