A248901 Numbers k such that A248891(k) = 1.

1, 2, 3, 4, 5, 20, 29, 30, 2059, 5987, 7119, 20165, 151819, 14984624, 105181798

Offset: 1

Author

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

Keywords

• nonn
• more

Comments

If k is in {1, 2, 3, 4, 29, ...} then both numbers k and k+1 are in the sequence.

Crossrefs

Cf. A001359, A248891, A248902, A248903.

Programs

PARI

lista(nn) = {my(c=0, q=r=5, s=3, t); forprime(p=9, nn, if(p-2==q, if((t=s^(1+1/c++))>r && tJinyuan Wang, Nov 28 2020

Extensions

a(13)-a(15) from Jinyuan Wang, Nov 28 2020