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.

A381034 Numbers that have a digit > 1 in their primorial base expansion, and that are multiples of the corresponding radix prime of the least significant such digit.

Original entry on oeis.org

15, 20, 25, 45, 50, 55, 63, 75, 80, 85, 91, 98, 105, 110, 115, 126, 135, 140, 145, 165, 170, 175, 182, 189, 195, 200, 205, 225, 230, 235, 255, 260, 265, 273, 285, 290, 295, 301, 308, 315, 320, 325, 336, 345, 350, 355, 375, 380, 385, 392, 399, 405, 410, 415, 429, 435, 440, 445, 451, 465, 470, 475, 483, 495, 500, 505
Offset: 1

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Author

Antti Karttunen, Feb 17 2025

Keywords

Examples

			A049345(15) = 211, the least significant digit larger than one is 2, where the corresponding radix prime is 5, and 5 divides 15, therefore 15 is included.
		

Crossrefs

Cf. A049345, A381032, A381033 (characteristic function), A381037 (subsequence).
Subsequence of the intersection A177711 and A381035.

Programs