A343128 Numbers k such that prime(prime(prime(k))) ends in k.

7, 229, 417, 657, 26203, 32553, 50971, 93487, 231221, 17064941, 54784601, 93007099, 981668491, 16040988367

Offset: 1

Author

Chai Wah Wu, Apr 06 2021

Keywords

• nonn
• base
• more

Examples

			417 is a term since prime(prime(prime(417))) = 302417.
26203 is a term since prime(prime(prime(26203))) = 73226203.
17064941 is a term since prime(prime(prime(17064941))) = 169217064941.
prime(prime(prime(54784601))) = 647454784601, prime(prime(prime(93007099))) = 1185993007099, prime(prime(prime(981668491))) = 17148981668491, prime(prime(prime(16040988367))) = 390416040988367. - _Chai Wah Wu_, Apr 14 2021
		

Crossrefs

Cf. A046883, A074978.

Programs

Python

A343128_list = [n for n in range(1,10**4) if n % 2 and n % 5 and prime(prime(prime(n))) % 10**(len(str(n))) == n]

Extensions

a(11)-a(14) from Chai Wah Wu, Apr 14 2021