The On-Line Encyclopedia of Integer Sequences (OEIS)

Revisions by Indranil Ghosh (See also Indranil Ghosh's wiki page)

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A335294

a(n) = pi(n) - pi(Sum_{k=1..n-1} a(k)) with a(1) = 1, where pi() is the prime counting function A000720.
(history; published version)

#51 by Indranil Ghosh at Sun Jun 21 11:31:24 EDT 2020

STATUS

editing

proposed

#50 by Indranil Ghosh at Sun Jun 21 11:30:57 EDT 2020

PROG

(Python)

from sympy import primepi

A = [1]

S = 1

for n in range(1, 101):

A += [primepi(n+1) - primepi(S), ]

S += A[n]

print(A) # Indranil Ghosh, Jun 21, 2020, after Robert Israel

STATUS

approved

editing

A210596

Triangle read by rows of coefficients of polynomials v(n,x) jointly generated with A210221; see the Formula section.
(history; published version)

#34 by Indranil Ghosh at Mon Apr 13 09:57:44 EDT 2020

STATUS

editing

proposed

#33 by Indranil Ghosh at Mon Apr 13 09:57:07 EDT 2020

PROG

for n in range(1, 13): print (a(n)) # _Indranil Ghish_, Ghosh_, May 27, 2017

#32 by Indranil Ghosh at Mon Apr 13 09:56:36 EDT 2020

PROG

for n in range(1, 13): print (a(n)) # _Indranil Ghish_, May 27, 2017

#31 by Indranil Ghosh at Mon Apr 13 09:54:14 EDT 2020

PROG

from sympy.abc import x

for n in range(1, 13): print (a(n))

STATUS

approved

editing

A207612

Triangle of coefficients of polynomials u(n,x) jointly generated with A207613; see the Formula section.
(history; published version)

#11 by Indranil Ghosh at Mon Apr 13 09:52:40 EDT 2020

STATUS

editing

proposed

#10 by Indranil Ghosh at Mon Apr 13 09:52:33 EDT 2020

PROG

fom sympy.abc import x

for n in range(1, 13): print (a(n) ) # Indranil Ghosh, May 28 2017

STATUS

approved

editing

A207611

Triangle of coefficients of polynomials v(n,x) jointly generated with A207610; see Formula section.
(history; published version)

#20 by Indranil Ghosh at Mon Apr 13 09:17:23 EDT 2020

STATUS

editing

proposed

#19 by Indranil Ghosh at Mon Apr 13 09:17:06 EDT 2020

PROG

from sympy.abc import x

for n in range(1, 13): print (a(n) ) # Indranil Ghosh, May 28 2017

STATUS

approved

editing