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a(n) is the least prime power (A246655) P such that P-n is the next smaller prime power below P.
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%I #7 Jun 17 2024 07:00:54

%S 3,7,16,23,37,59,1031,97,521,149,536870923,211,144115188075855872,307,

%T 65536,1847,8209,1087,147573952589676412928,907,524309,1151,

%U 549755813911,4201,17179869209,2503,16411,2999,131101,1361,34359738368,5623,18014398509481984,8501,33554467,9587

%N a(n) is the least prime power (A246655) P such that P-n is the next smaller prime power below P.

%C If powers of primes (A000961) were used instead of A246655, a(1) would be 2.

%F a(n) = A290515(n) + n for n > 1.

%Y Cf. A246655, A057820, A110968, A290515, A000961.

%K nonn

%O 1,1

%A _Hugo Pfoertner_, Jun 16 2024