A383295 Positions of proper prime powers (A246547) in EKG-sequence.

3, 6, 8, 17, 22, 24, 31, 50, 64, 76, 112, 122, 124, 171, 232, 240, 290, 319, 359, 485, 521, 595, 696, 823, 947, 982, 1279, 1313, 1642, 1810, 1961, 2090, 2096, 2168, 2306, 2736, 3002, 3398, 3638, 3932, 4379, 4733, 4913, 5207, 6072, 6312, 6583, 6710, 7717, 7898, 9165, 9929, 10298, 11144, 11568, 11786, 12430, 14138

Offset

1,1

Comments

Apparently also numbers k for which A265576(k) > 1 and A064413(k) is neither 2 nor 2*odd prime.

Links

Antti Karttunen, Table of n, a(n) for n = 1..321

Index entries for sequences related to EKG sequence.

Prog

(PARI) isA383295(n) = { my(x=A064413(n)); (isprimepower(x) && !isprime(x)); };

Crossrefs

Cf. A064413, A246547, A265576.

Setwise difference A383294 \ A064955.

Conjectured to be a subsequence of A383285.

Sequence in context: A123208 A179652 A253855 * A298860 A068979 A101060

Adjacent sequences: A383292 A383293 A383294 * A383296 A383297 A383298

Keyword

nonn

Author

Antti Karttunen, Apr 22 2025

Status

approved