A261087 - OEIS

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A261087

Primes p for which A155043(p) < A155043(prevprime(p)), where A155043 gives the number of steps needed to reach zero when repeatedly applying the map that replaces k with k - A000005(k).

83, 127, 227, 281, 307, 367, 443, 541, 631, 677, 853, 863, 967, 1091, 1217, 1427, 1451, 1487, 1523, 1667, 1787, 1861, 1997, 2027, 2153, 2207, 2297, 2339, 2411, 2477, 2543, 2693, 2711, 2837, 2909, 2963, 3089, 3251, 3313, 3323, 3467, 3533, 3593, 3677, 3719, 3797, 3863, 3917, 3989, 4007, 4019, 4091, 4259, 4447, 4493, 4643, 4657, 4783, 4787, 4799, 4877, 4937, 5087, 5119, 5441

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OFFSET

1,1

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000040(A261086(n)).

EXAMPLE

A155043(83) = 16 although A155043(79) = 26, thus 83 is included in this sequence.

PROG

(Scheme) (define (A261087 n) (A000040 (A261086 n)))

CROSSREFS