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.

Showing 1-3 of 3 results.

A241623 Indices of the primes in A073861 (n-digit primes followed by a maximal gap).

Original entry on oeis.org

2, 24, 154, 1183, 3385, 40933, 325852, 2850174, 23163298, 203615628, 1820471368, 28106444830, 251265078335, 2921439731020, 6822667965940, 49749629143526, 2133658100875638, 20004097201301079
Offset: 1

Views

Author

M. F. Hasler, Apr 26 2014

Keywords

Comments

"Indices" here means the value of the function primepi = A000720, cf. formula.
Subsequence of A005669.

Crossrefs

See also A214935(n) = A000720(A205827(n)), A005669(n) = A000720(A002386(n)).

Formula

a(n) = A000720(A073861(n)).
a(n) = A005669(k) with k such that A002386(k) = A073861(n).

A241540 Indices of primes p in A182514, i.e., a(n) = primepi(p) = A000720(A182514(n)).

Original entry on oeis.org

1, 2, 4, 30, 217, 49749629143526
Offset: 1

Views

Author

M. F. Hasler, Apr 25 2014

Keywords

Comments

a(6) = A214935(33) = A000720(A205827(33)).

Crossrefs

Cf. A053302, A053976, A073861, A111870, A111943, A182514.
See also A214935(n)=A000720(A205827(n)), A005669(n) = A000720(A002386(n)).

A053302 Largest n-digit prime at the start of a record in the RECORDS transform of the prime gaps.

Original entry on oeis.org

7, 89, 887, 9551, 31397, 492113, 4652353, 47326693, 436273009, 4302407359, 42652618343, 738832927927, 7177162611713, 90874329411493, 218209405436543, 1693182318746371
Offset: 1

Views

Author

Enoch Haga, Mar 05 2000

Keywords

Comments

a(17) is probably 80873624627234849 and a(19) is probably 8822016561303449927. - Robert G. Wilson v, Mar 16 2004
a(18) is most probably 804212830686677669. - M. F. Hasler, Apr 25 2014
Is this a duplicate of A073861 (except for the first term)? - M. F. Hasler, Apr 25 2014

Examples

			a(5)=31397, the last 5-digit prime to begin a gap.

Links

Crossrefs

The length of the gap is in A053303.

Formula

a(n) = { max p: p in A002386; p< 10^n}. - R. J. Mathar, Feb 01 2008

Extensions

Corrected by Jud McCranie, Jan 03 2001
a(15) and a(16) from Robert G. Wilson v, Mar 16 2004
Edited by R. J. Mathar, Feb 01 2008
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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