cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A383288 Numbers k for which A276075(k) is a multiple of 4, where A276075 is fully additive with a(p) = PrimePi(p)!.

Original entry on oeis.org

1, 7, 9, 11, 12, 13, 15, 16, 17, 19, 20, 23, 25, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 63, 67, 71, 73, 77, 79, 81, 83, 84, 89, 91, 97, 99, 101, 103, 105, 107, 108, 109, 112, 113, 117, 119, 121, 127, 131, 132, 133, 135, 137, 139, 140, 143, 144, 149, 151, 153, 156, 157, 161, 163, 165, 167, 169, 171, 173, 175, 176
Offset: 1

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Author

Antti Karttunen, May 15 2025

Keywords

Comments

All primes > 5 are included.

Examples

			7 = prime(4), and because 4 divides 24 (= 4!), 7 is present.
9 = prime(2)*prime(2), and because 4 divides 2! + 2! = 4, 9 is present.
		

Crossrefs

Cf. A276075, A383287 (characteristic function).
Cf. also A339746, A369002.

Programs